Problem: Consider the following Gibbs energies at 25 °C.Substance                           ΔG°f (kJ•mol-1Ag+(aq)                                    77.1Cl-(aq)                                     -131.2AgCl(s)                                    -109.8Br-(aq)                                     -104.0AgBr(s)                                    -96.9a) Calculate AG°rxn for the dissolution of AgBr(s)._____ kJ•mol-1b) Calculate the solubility-product constant of AgBr.K = _____

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Dissolution of AgCl(s): AgBr(s) ⇌ Ag+(aq) + Br(aq)


a) Recall:

ΔG°rxn=ΔG°f, products-ΔG°f, reactants


Given:

Ag+(aq) = 77.1 kJ/mol

Br(aq) =  –104.0 kJ/mol

AgCl(s) =  –96.9 kJ/mol

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Problem Details

Consider the following Gibbs energies at 25 °C.

Substance                           ΔG°(kJ•mol-1

Ag+(aq)                                    77.1

Cl-(aq)                                     -131.2

AgCl(s)                                    -109.8

Br-(aq)                                     -104.0

AgBr(s)                                    -96.9


a) Calculate AG°rxn for the dissolution of AgBr(s).

_____ kJ•mol-1

b) Calculate the solubility-product constant of AgBr.

K = _____

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