Question

1. If you were to dissolve each of the following in water, a) write a balanced chemical equation b) write the K_spexpression.

1. CaCO₃

2. PbBr­₂

3. Ag₂CrO₄

Answer 1

Solution :

The balanced chemical equation and expression for solubility product (Ksp) for the given salts in water are given below. All the given salts are sparingly soluble salts, hence they dissociated into constituent ions in water.

A) CaCO3

Chemical equation :

CaCO3(s) + H2O ==> Ca2+(aq) + CO3^2- (aq)

Ksp = [Ca2+] [CO3^2-]

B) PbBr2

Chemical equation :

PbBr2 (s) + H2O ---> Pb2+ (aq) + 2Br-(aq)

Ksp = [Pb2+] [Br-]^2

C) Ag2CrO4

Chemical equation :

Ag2CrO4(s) + H2O ---> 2Ag+ (aq) + CrO4^2- (aq)

Ksp = [Ag+]^2 [CrO4^2-]