Question

[ 3.31 101 I0.35*105]-1.168*109, which is smaller than calcium oxalate Ksp. So it will not precipitate. Q4. In the above example, imagine the concentration of calcium and oxalate ions in urine doubled due to dehydration. Will calcium oxalate precipitate? Q5. AgCl (s) ? Ag+(aq) + cl. (aq), Ksp = [Ag+] [Cl], Ksp of AgCl = 1.77*1010. What is the solubility of AgCI in water?

Answer 1

4)

Qsp = ( 2 x 3.31 x 10^-4 ) ( 2 x 0.35 x 10^-5)

         = 4.63 x 10^-9

Ksp of CaC2O4 = 2.32 x 10^-9

Qsp > Ksp .

so there will be precipitate formed

5)

Ksp = [Ag+] [Cl-] = S x S = S^2

1.77 x 10^-10 = S^2

S = 1.33 x 10^-5 M

solubility = 1.33 x 10^-5 M