
a)
Ag2CrO4 (s) > 2Ag+ (aq) + CrO4^{2}(aq)
Ksp = 1.1 x10^{12}
In presence of 0.2M AgNO3
Ag2CrO4 (s) > 2Ag+ (aq) + CrO4^{2}(aq)
 0.2 x where x is the solubility in AgNO3 solution
Thus Ksp = [Ag+]^{2}[CrO4^{2}]
= (0.2)^{2}x = 1.1 x10^{12}
Thus x = 2.75x10^{11} M
Solubility of silver chromate in AgNo3 is 2.75x10^{11} M
b) similarly in 0.2M Na2CrO4
Ag2CrO4 (s) > 2Ag+ (aq) + CrO4^{2}(aq)
 2x 0.2 where x is the solubility in AgNO3 solution
Thus Ksp =1.1 x10^{12} = (2x)^{2} x0.2
Thus x = 1.17 x 10^{6} M
solubility of silver chromate in sodium chromate = 1.17x10^{6} M
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