POST LABORATORY QUESTIONS 1. (a) Write the equilibrium expression for the reacti

Question

POST LABORATORY QUESTIONS 1. (a) Write the equilibrium expression for the reaction between Fe and SCN: Fe3+ (aq) SCN- + (aq) FeSCN2+ (aq) (b) Given the following equations, explain the results you obtained for Part One. FeSCN2+ (aq) + Ag+ (aq) . AgSCN (s) + Fe3+ (aq) FeSCN2+ (aq) + F. (aq) _ Fep2. (aq) +SCN' (aq) 2. If a reaction is exothermic, adding heat will shift the equilibrium to the left (towards the reactants) and removing heat will shift the equilibrium to the right (towards the products). The opposite holds true for endothermic reactions. Based upon your results, classify each of the reaction systems you studied in Part Two as exothermic or endothermic.

Explanation / Answer

1)   a)

   Fe3+ + SCN- (aq)    <--------------> FeSCN2+ (aq)

Equilibrium constant,

   K = Equilibrium concentration of products / Equilibrium concentration of reactants

       =   [Fe(SCN)2+]/ [Fe3+] [SCN-]

b) part one details are not given to solve this part.

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