Question

The thermodynamic solubility product of AgCl is 1.6 x 10^-10. What is [Ag⁺] in (a) a 0.020 molar KNO₃ solution and (b) a 0.020 molar KCl solution?

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Answer 1

a) 1.6 x 10^-10 = [Ag⁺][Cl^-]

The presence of KNO₃ won't change the concentration of any of them, so we will proceed as follows:

1.6 x 10^-10 = x²

x = 1.2649 x 10^-5 M = [Ag⁺]

For case b)

1.6 x 10-10 = [Ag+] [0.02]

[Ag⁺] = 8 x 10^-9