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Iron Thiocyanate Equilibrium Lab Answers

So, the initial solution color (middle tube) is a mixture of yellow and dark red colors due to the presence of both the Fe +3 ion and the FeSCN +2 complex. To answer this question, the relative amounts of toxic thiocyanate ion in saliva obtained from a variety of individuals are compared. The solution. To demonstrate this phenomenon, we will study the equilibrium system of iron(III) and thiocyanate ion and forming thiocyanatoiron (III), a complex ion. Always wash hands frequently while in lab. 1 :Study of shift in equilibrium in the reaction of ferric ions and thiocyanate ions F OREWORD P REFACE 16 16 18 19 20. Equilibrium Of The Iron Thiocyanate Reaction Many Wofford The reaction has two possible products given below, in lab this week you will Figure 1 the iron thiocyanate ion absorbance at 460 nm is plotted as a function of Report the equilibrium constant, K, as an average of the five experimental. Iron(III) - Thiocyanate Ion Comlex. Cast iron is a combo of carbon, manganese, iron, and silicon. Read the lab thoroughly and answer the pre-lab questions that appear at the end of this lab exercise. Use your knowledge of Le Châtelier’s principle to write a Problem statement, and then design and carry out a simple investigation to determine whether the reaction as written is. 0020 M KSCN Solution And Then Filled The Flask Up To The Mark With Deionized Water. The lab on Le Chatelier's Principle in Iron Thiocyanate Equilibrium had me prepare an equilibrium system for the following reaction. Irom aqueous solution4 of ferric chloride with excess of potassium thiocyanate, double compounds to which they ascribed the formulae. The experiment is very simple: Prepare a very concentrated solution of NH4SCN or KSCN in water (e.



The formation of CoCl4 2- from Co 2+ and Cl- is endothermic. Some analyses may require more than the normal lab time to complete (especially when oven drying and some other steps are required). Bayard Rustin H. Introduction A. Fe(SCN)2+ is the monothiocyanatoiron(III) ion, one of the so-called complex ions. This is known as LeChâtelier's principle. 7, and record these values in Table 5. In the lab you did the following reaction… Fe3+ + SCN-FeSCN2+ iron thiocyanate iron (III) thiocyanate cation Take a few moments to notice the similarities between this chemical reaction and circle-square “reaction”. Write your answer as a clear, descriptive paragraph. Fe^3+(aq) + SCN-(aq) in equilibrium with FeSCN^2+(aq) What is the net ionic equation when you add Fe(NO3)3 to the equilibrium system?. pdf Free Download Here An absorbance vs. The iron (III) thiocyanate product is orange, but both reactants are colorless in aqueous solution. Experiment 8: DETERMINATION OF AN EQUILIBRIUM CONSTANT 77 Purpose: The equilibrium constant for the formation of iron(III) thiocyanate complex ion is to be determined. Support any and all explanations with your. As you saw in the previous experiment, Fe 3+ ion and SCN-react with each other to form a red complex ion, [FeSCN] 2+. 50 mL increments of 0. ion is green, answer the questions below. HW: Complete the following journal entry -. I'm writing a lab writeup right now, and I need it to compare my values to the accepted values.



200 mol/L solution of iron(III) nitrate 0. Below are the values of the Ksp product constant for the most common salts. In an equilibriumsystem, forward and reverse reactions occur at equal rates so that no net change is produced. Feel free to remove it, and use it as scrap paper. of moles increases' This is probably a very reliable answer. Potassium thiocyanate (KSCN) is moderately toxic by ingestion; emits toxic fumes of cyanide if strongly heated or in contact with concentrated acids. Related searches for le chatelier principle virtual lab an… Le Chatelier's Principle Lab Report Le Chatelier's Principle Answer Key Le Chatelier's Principle Worksheet Le Chatelier's Principle Khan Academy Le Chatelier's Principle for Dummies Equilibrium and LeChatelier's Principle Lab Le Chatelier Pronunciation Le Chatelier Flask Related. In this experiment, you will determine the value of Keq for the reaction between iron (III) ions and thiocyanate ions, SCN–. The following information should allow you to develop a research plan for evaluating the equilibrium constant of the iron (II) thiocyanate ion in aqueous solution. I'm writing a lab writeup right now, and I need it to compare my values to the accepted values. Finding Equilibrium Constant for the Iron III Ion and. Lab 11 - Spectroscopic Determination of an Equilibrium Constant Goal and Overview The reaction of iron (III) with thiocyanate to yield the colored product, iron (III) thiocyanate, can be described by the following equilibrium expression. Complex-Ion Equilibrium of Iron(II1) and Thiocyanate Ions Part B. Stress refers to changes in concentration, pressure, volume, and temperature. Lab 3 Iron - Thiocyanate Reaction. CHM112 Lab – Determination of an Equilibrium Constant – Grading Rubric Criteria Points possible Points earned Lab Performance Printed lab handout and rubric was brought to lab 3 Initial concentrations completed before coming to lab. Obviously, if. In the previous experiment, you used very dilute (0. When an aqueous solution containing iron (III) ions, Fe+3, is combined with another solution containing thiocyanate ions, SCN-, the following reaction occurs: Fe+3 (aq) + SCN-(aq) FeSCN +2 (aq) (rxn. Lab #8: Chemical Equilibrium Objective: To observe and explain the effect of an applied stress on chemical systems at equilibrium by applying the Le Châtelier’s Principle.



Remember some reactions do not go to completion and are reversible primarily because of the relative ‘instability’ of the products formed. Things to Know for AP Chemistry Things to Memorize The following should be memorized. REACHING EQUILIBRIUM A typical assumption, initially made when studying chemistry, is that all reactants. Iron (III) chloride (FeCl 3) solution concentrated HCl Ammonium thiocyanate (NH 4 CNS) solution Objectives. It assumes that you know why these ions are acidic, and are happy about the equilibria involved. Silver thiocyanate precipitates. Some parameters that affect the complete oxidation of the ferrous cations. Experiment 5: LeChatelier's Principle I. If two reactants are mixed, they will tend to react to form products until a state is reached where the amounts of reactants and products no longer change. pdf Free Download Here An absorbance vs. Best Answer: Lancenigo di Villorba (TV), Italy It is not a common event write about this compound. To minimize the change, by Le Chˆatlier's Principle, the reaction must shift to the right. In this video you will learn how to determine the equilibrium constant of a system using Beer-Lambert law. (b) The concentration of silver ions in the equilibrium mixture can be found by titration with potassium thiocyanate. 3+ (aq) + SCN-(aq) Fe(SCN) 2+ (aq) Iron (III) cation thiocyanate. Determine the equilibrium concentration of FeSCN for each of the solutions E2-E6 from 5. your Beer's Law plot, and record these values in Table 5.



Ripening of fruit and cooking of eggs are also chemical changes. UNIT-4 :Chemical Equilibrium (Ionic Equilibrium in Solution) • Experiment 4. Determine the equilibrium constant of the formation of the thiocyanatoiron (III) ions. For the cobalt (II) complex equilibrium, is the forward or reverse reaction endothermic? Support you answer with observations. Equilibrium Constant Report Example 4. THE IRON(III) – THIOCYANATE REACTION SYSTEM Prepared by Ross S. A stock solution of FeSCN 2+ was then made. The extent to which reactants are converted to products is expressed by the equilibrium constant, K. – iron(III) nitrate and potassium thiocyanate theory and reaction rate in order to analyse chemical equilibrium reactions (ACSCH070, ACSCH094) HSC Study Lab. Manatee Community College. Be sure to show all. The Iron(III) - Thiocyanate Equilibrium Pages 150-151 and Page 158. Laboratory 2: The Equilibrium Constant for the Formation of the Iron(III) Thiocyanate Complex Reading: Olmstead and Williams, Chemistry , Chapter 14 (all sections) Purpose: The equilibrium constant for the reaction Fe 3+ (aq) + NCS – (aq) →← FeNCS – (aq) is determined. The formal way of stating this is called Le Chatlier’s Principle - If stress is placed on a system at equilibrium, the equilibrium will shift in a direction in order to overcome the stress. Understand the application of using a spectrophotometer to measure concentration of colored ions.



Best Answer: Maybe the temperature changed, because if it did then the equilibrium constant won't be a constant anymore and im sure u know that in this case Keq. New Equilibrium Position Established:. Copper Reactions Lab – stoichiometry of various reactions starting with copper and resulting in the formation of copper once again. on StudyBlue. Students make observations of their. Advanced Placement Chemistry. Determine the equilibrium constant of the formation of the thiocyanatoiron (III) ions. Fe(SCN)2+ is the monothiocyanatoiron(III) ion, one of the so-called complex ions. Determination of an Equilibrium Constant: the iron thiocyanate reaction Learn with flashcards, games, and more — for free. Complex ions refer to a metal cation bonded to either one or more than one molecules. Measurement of an Equilibrium Constant. Click on the SDS you are looking for to download. A reference Table of Reactions is attached to aid in your explanations. THE IRON(III) - THIOCYANATE REACTION SYSTEM Prepared by Ross S. 00100 M KSCN are added to 4. It is basically an oxidation reaction. Using separate pipets, 1 mL of iron(III) nitrate and 2 mL of phosphate thiocyanate were added to the beaker. Background information for this lab can be found in chapter 17 of your textbook (Silberberg 5th ed). 0 mL total volume each) of iron by diluting the stock solution. Iron (III) Thiocyanate Equilibrium System Nathan Gignac, Megan Lindley, Megan Moore, Josh.



The product produced, iron(III)thiocyanate ion (Fe(SCN)2+) is yellow. As understood, skill does not suggest that you have astonishing points. Rewrite the cobalt (II) complex equilibrium with "energy" on the appropriate side. Hot Plate spatula solid iron III nitrate Solid potassium thiocyanate 0. 5) CF4 XeF4 ClF3 (a) Draw a Lewis electron-dot structure for each of the molecules above and identify the shape of each. Lab 11 - Spectroscopic Determination of an Equilibrium Constant Goal and Overview The reaction of iron (III) with thiocyanate to yield the colored product, iron (III Salts & Solubility - Solutions, Chemical Equilibrium. Le Chatelier's Principle Lab: Due February 15th, 2013 Purpose: The purpose of this experiment is to determine the effects of various stresses, such as changes in temperature or concentrations of reactants and products, imposed on a system on its equilibrium. Colour of control tube _____. Procedure: Solution Preparation: 1. This is known as LeChâtelier's principle. Procedure: A. your answer. HELP!! on net ionic equations on reactions, chemistry Le Chatelier principle in iron thiocyanate equilibrium? FIRST QUESTION Write the net ionic equations of the following reactions that occured in test tubes 1-6. 1M!affect the!number!of!drops!required!for!the!observed. In this experiment, you will determine the value of Keq for the reaction between iron (III) ions and thiocyanate ions, SCN–.



• Confirm the stoichiometry of the reaction. Closed-toe shoes are recommended to protect feet from splashes. Its value indicates the degree to which a compound dissociates in water. With the last solution still in the Spec 200 instrument, drop a few crystals of solid KSCN into the cuvette and note any changes to the percent transmittance. As you saw in the previous experiment, Fe 3+ ion and SCN-react with each other to form a red complex ion, [FeSCN] 2+. You will be shown a chemical equilibrium reaction at the. Some people. Record the exact molarity of the two iron solutions and the thiocyanate solution below. Explain, using LeChatelier's Principle, the results obtained when 0. Introduction. Flinn AP Lab #17 K eq 2+for Fe(SCN) Experiment: The Determination of K eq for FeSCN 2+ Introduction For any reversible chemical reaction at equilibrium, the concentrations of all reactants and products are constant or stable. 2 ml) of concentrated nitric acid (65% HNO3 by weight). on your data sheet. 01M Fe(NO3)3 and 10 mL of M 0. AP Chemistry Lab 15 2 Determination of the Equilibrium Constant for the Formation of FeSCN2+ INTRODUCTION There are many reactions that take place in solution that are equilibrium reactions; that is, they do not go to completion, and both reactants and products are always present. Ammonium salts are commonly used in fertilizers. 2+ Please refer to the lab manual B.



Page I-1 / Determination of an Equilibrium Constant Lab Determination Of An Equilibrium Constant In this experiment the equilibrium properties of the reaction between the iron(III) ion and the thiocyanate ion will be studied. New Equilibrium Position Established:. 00100 M KSCN are added to 4. I need help to find out what the average molecular mass of these alloys are Carbon steel, Cast iron, Manganese Steel, Common steel, Tungsten Steel, and Silicon steel. A 50 mL of Potassium Hydroxide Solution was diluted to 200 mL with de-ionized water. Subject: Chemistry (HS) Topic: Chemical Equilibrium Observing the Effect of a Change in Conditions on a System at Equilibrium by Applying Le Chatelier's Principle. It assumes that you know why these ions are acidic, and are happy about the equilibria involved. CONNICK AND CLAUDE P. How could you shift the reaction to change the concentration of the complex ion? OBJECT. 10 mL increments of 0. If one of the products we are trying to examine is colored, it becomes significantly easier to determine its concentration. 175 M solution of oxalic acid (C2H2O4). You will not be allowed to start the ex-. NORTH ALLEGHENY SENIOR HIGH SCHOOL. The next two lab experiments involve the complex ion formation of iron(III) thiocyanate from aqueous iron(III) ion, Fe3+ (from Fe(NO 33) ), with aqueous thiocyanate ion, SCNG (from NH 4 SCN). Le Châtelier's Principle and Equilibrium Lab Assignment.



Solubility product constant is simplified equilibrium constant (Ksp) defined for equilibrium between a solids and its respective ions in a solution. When equilibrium is reached by a reaction in a test tube, it appears that changes have. Changing data for a lab project to fit the perceived. If one of the products we are trying to examine is colored, it becomes significantly easier to determine its concentration. Use the upper one to read the volumes. Read the lab thoroughly and answer the pre-lab questions that appear at the end of this lab exercise. If there are any other salts for which you know the value of the constant, please let us know and we will update the table. Le Châtelier's Principle and Equilibrium Lab Assignment. CHM112 Lab - Determination of an Equilibrium Constant - Grading Rubric Criteria Points possible Points earned Lab Performance Printed lab handout and rubric was brought to lab 3 Initial concentrations completed before coming to lab. The possibility of using thiocyanate to determine iron(II) and/or iron(III) in water-acetone mixture has been re-examined as part of a systematic and comparative study involving metallic complexes of pseudohalide ligands. The Iron-Thiocyanate Equilibrium When potassium thiocyanate [KNCS] is mixed with iron(III) nitrate [Fe(NO 3) 3] in solution, an equilibrium mixture of Fe+3, NCS-, and the complex ion FeNCS+2 is formed (equation 1). In an equilibrium system, forward and reverse reactions occur at equal rates so that no net change is produced. 01 M KSCN, to the first test tube we added ten drops of water and used it as our control to compare color changes. The red color of it will disappear. Fe^3+(aq) + SCN-(aq) in equilibrium with FeSCN^2+(aq) What is the net ionic equation when you add Fe(NO3)3 to the equilibrium system?. In this experiment we will study the equilibrium properties of the reaction between iron(III) ion and thiocyanate ion:. Honour Chemistry Lab #8 Page 1 of 4. This solution contains a pair of complex ions. Your Answer is very. Laboratory 2: The Equilibrium Constant for the Formation of the Iron(III) Thiocyanate Complex Reading: Olmstead and Williams, Chemistry , Chapter 14 (all sections) Purpose: The equilibrium constant for the reaction Fe 3+ (aq) + NCS - (aq) →← FeNCS - (aq) is determined.



The two words are synonymous, so if you're looking for the number of atoms in an element, the answer is always one, and only one. The temperature and ionicstrength of the solutions were carefully controlled, and suitable precautions were taken against fading. The blood red coloration that results is due to the formation of a new ion as follows: Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq). 50 M of HNO3 (aq). Explain what is meant by an equilibrium constant. Swirl the test tube. The two equilibrium lab experiments involve the complex ion formation of iron(III) thiocyanate from aqueous iron(III) ion, Fe3+, with aqueous thiocyanate ion, SCN‾. Using separate pipets, 1 mL of iron(III) nitrate and 2 mL of phosphate thiocyanate were added to the beaker. Consider the exothermic chemical reac-tion: SO 2 (g) + 0. the Law of Chemical Equilibrium, which imposes a condition on the concentrations of reactants and products. Then 5g of glucose and several drops of methylene blue was add to this solution. The solution becomes more yellow B. The next two lab experiments involve the complex ion formation of iron(III) thiocyanate from aqueous iron(III) ion, Fe3+ (from Fe(NO 33) ), with aqueous thiocyanate ion, SCNG (from NH 4 SCN). 9KSCN, Fe(SCN)3,. Iron (III) chloride (FeCl 3) solution concentrated HCl Ammonium thiocyanate (NH 4 CNS) solution Objectives. If you add thiocyanate ions, SCN-, (from, say, sodium or potassium or ammonium thiocyanate solution) to a solution containing iron(III) ions, you get an intense blood red solution containing the ion [Fe(SCN)(H 2 O. The silver draws off the thiocyanate forming silver thiocyanate: Ag + + SCN---> AgSCN. The colors before and after the cooling were noted. 30 M for each of these ions, what is the equilibrium concentrationof the red iron (III)-thiocyanate complex?.



Bayard Rustin H. is at equilibrium. Discussion Questions: Answer each of the following on a separate sheet of paper and staple to your lab report before handing it in. Shaking the solution raises the. Iron(III) Nitrate and Potassium Thiocyanate Introduction: Although equilibrium concentrations are very important quantities, they are often difficult to measure. In your laboratory report, show a sample of each type of calculation. Lab 11 - Spectroscopic Determination of an Equilibrium Constant Goal and Overview The reaction of iron (III) with thiocyanate to yield the colored product, iron (III determination of keq for fescn lab answers - Findeen. When equilibrium is reached by a reaction in a test tube, it appears that changes have. Table of Contents Lab Manual Introduction i. With the last solution still in the Spec 200 instrument, drop a few crystals of solid KSCN into the cuvette and note any changes to the percent transmittance. A stock solution of FeSCN 2+ was then made. This provides an extremely sensitive test for iron(III) ions in solution. 2-hydroxy-1-naphthaldehyde-p-hydroxybenzoichydrazone (HNAHBH) reacts with iron(II) and cobalt(II) to form reddish-brown and yellow-coloured [Fe(II)-HNAHBH] and [Co(II)-HNAHBH] complexes, respectively. SOME MEASUREMENTS ON THE IRON (111) - THIOCYANATE SYSTEM IN AQUEOUS SOLUTION' ABSTRACT A spectrophotometric study of the ferric thiocyanate system is reported. 00100 M KSCN are added to 4. Equilibrium calculations, Equilibrium constants, reaction quotients, and the state. • Iron nitrate solutions are prepared in nitric acid—use with caution. The next two lab experiments involve the complex ion formation of iron(III) thiocyanate from aqueous iron(III) ion, Fe3+ (from Fe(NO 33) ), with aqueous thiocyanate ion, SCNG (from NH 4 SCN). The nitrate ions, NO3 − and the sodium ions, Na+ are spectator ions, and as such they do not participate in the reaction. There is no further net change in the amounts of reactants and products unless the reaction mixture is disturbed in some.



Equilibrium of Ni2 When 6. Consider the exothermic chemical reac-tion: SO 2 (g) + 0. 2 Safety and proper waste disposal procedures observed 2. Chemical Equilibrium Lab Data. Question: Determination Of An Equilibrium Constant Lab First We Made A Diluted Solution Of Thiocyanate In A 100mL Volumetric Flask. Today, we began our investigation into factors which affect equilibrium in the "Exploring Equilibrium - It Works Both Ways" Lab. Read the initial volume from the calibration scale on the buret. 541 Mark Jefferson Science Complex Ypsilanti, Michigan 48197. Remember some reactions do not go to completion and are reversible primarily because of the relative ‘instability’ of the products formed. Its value indicates the degree to which a compound dissociates in water. Experiment 3 Measurement of an Equilibrium Constant Introduction: Most chemical reactions (e. Swirl the test tube. Iron(III) Nitrate and Potassium Thiocyanate Introduction: Although equilibrium concentrations are very important quantities, they are often difficult to measure. Your job is to use these materials to cause equilibrium shifts. A solution of iron(III) thiocyanate was produced by dissolving 7. Complex-Ion Equilibrium of Iron(II1) and Thiocyanate Ions Part B. Students make observations of their. This page describes and explains the reactions between complex ions of the type [M(H 2 O) 6] n+ and hydroxide ions from, for example, sodium hydroxide solution. Determination of an Equilibrium Constant for the Iron(III) Thiocyanate Reaction Calculations for Part A 1.



Chemical equilibrium. the equilibrium shifts to the right to accommodate the excess reactant (NH3). equilibrium according to its given equilibrium constant, Kc. The new equilibrium will have less water vapor and more liquid water than the old equilibrium. 700 mole x 34. 0 x 10 -11. We will complete the discussion of the lab tomorrow. The formal way of stating this is called Le Chatlier’s Principle - If stress is placed on a system at equilibrium, the equilibrium will shift in a direction in order to overcome the stress. Scientists know of 118 different elements, which they categorize in the periodic table, a diagram that arranges them in increasing order according to the number of protons in their nuclei. The following information should allow you to develop a research plan for evaluating the equilibrium constant of the iron (II) thiocyanate ion in aqueous solution. Closed-toe shoes are recommended to protect feet from splashes. Best Answer: Lancenigo di Villorba (TV), Italy It is not a common event write about this compound. Procedure: Solution Preparation: 1. Another example of combined equilibria revolves around the aqueous chemistry of the Fe 3+ ion. Red coloured iron thiocyanate ions form. The solution turns darker red C. for the Humanities, Manhattan. And if you remove something in a reaction that is an equilibrium one, the concentrations of the reacting partners will shift to reestablish the equilibrium. Introduction. 2 Safety and proper waste disposal procedures observed 2.



These ions disproportionate in the presence of cyanide ions, forming thiocyanate ions. the Law of Chemical Equilibrium, which imposes a condition on the concentrations of reactants and products. Absorbance of iron (Il) thiocyanate Volume, ml Fe3- 10. 81 Lab 5: Determining K, for Iron Thiocyanate by Spectrophotometry 9. Record the exact molarity of the two iron solutions and the thiocyanate solution below. Constant temperature baths will be set up in the lab for you to use in this experiment. the equilibrium shifts to the right to accommodate the excess reactant (NH3). Lab 3 Iron - Thiocyanate Reaction. Best Answer: What is the evidence for a shift in equilibrium when iron(III)chloride is added to the stock solution? Goes to right, so blood red colour intensifies What is the evidence for a shift in equilibrium when potassium thiocyanate is added to the stock solution? Also goes to right, so blood red colour intensifies. Use your knowledge of Le Châtelier's principle to write a Problem statement, and then design and carry out a simple investigation to determine whether the reaction as written is. It is the oxygens that form bonds with the iron atom, in a roughly octahedral arrangement: two oxygen atoms in each coordinate direction, one on either side. 2 log K6 = 6. Stay in touch with MediaLab - sign up for MediaLab's mailing list. Choose from 32 different sets of thiocyanate flashcards on Quizlet. Manatee Community College. The relevant chemical equation for this lab is: Fe+3 (aq) + SCN-(aq) qe FeSCN+2 (aq) =. K is found by taking the concentration and order of the products and dividing by the concentration and order of the reactants.



Record the exact molarity of the two iron solutions and the thiocyanate solution below. (a) Using a measuring cylinder, add 10 cm 3 of 0. We will complete the discussion of the lab tomorrow. Like any colored. The second part of the lab also demonstrated oxidation-reduction reactions. LAB EXAM - Lab 5. THE IRON(III) – THIOCYANATE REACTION SYSTEM Prepared by Ross S. Best Answer: What is the evidence for a shift in equilibrium when iron(III)chloride is added to the stock solution? Goes to right, so blood red colour intensifies What is the evidence for a shift in equilibrium when potassium thiocyanate is added to the stock solution? Also goes to right, so blood red colour intensifies. From the data, values of the. This means that more FeSCN2 ions will form, and the reaction mixture will have a. Record the colour of the solution. In this experiment, you will determine the value of Keq for the reaction between iron (III) ions and thiocyanate ions, SCN-. ABOUT ITS SOURCE In the lab's stores, you may find thiocyanate's stuffs as. Equilibrium Constant of a Complex Essay examples. How To Calculate The Equilibrium Constant K - Chemical Equilibrium Problems & Ice Tables - Duration: 12:34. Experiment 5 Stress on Equilibrium System 4 0. The backward reaction must be endothermic because the reactant (FeSCN2+) uses energy from the boiling water to convert into the products. Iron Thiocyanate Equilibrium Lab Answers.

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