Question

Determine the solubilities of silver chromate, barium chromate, ferric hydroxide, lead chloride and mercurous iodide at 298K from their solubility product constants.Determine also the molarities of individual ions.

Answer 1

(1) Silver chromate:
Ag2CrO4$\rightarrow$2Ag+ + CrO42-
Then, Ksp=[Ag+]2[CrO42-]
Let the solubility of Ag2CrO2 be s
[Ag+]22s and [CrO42-] = s
$\Rightarrow$ [Ag+]2s and [CrO42-] =s
Then,
Ksp=(2s)2.s=4s3
$\Rightarrow$ 1.1$\times$10-12
.275$\times$10-12=s3
S=0.65$\times$10-4M
Molarity of Ag+= 2s = 2 × 0.65 × 10-4 = 1.30 × 10-4 M