Question

The solubility product of BaCrO4 is 2.4 × 10–10 M2. The maximum concentration of Ba(NO3)2 possible without precipitation in a 6 × 10–4 M K2CrO4 solution is

• A. 4 × 10–7 M
• B. 1.2 × 1010 M
• C. 6 × 10–4 M
• D. 3 × 10–4 M.

Answer 1

Answer: (A)

4 × 10–7 M

Answer 2

KSP (Ba CrO4) = 2.4 × 10–10 M2

[CrO4–2] = 6 × 10–4

KSP (BaCrO4) = [Ba+2] [CrO4–2] 2.4 × 10–10

̃ [Ba+] × 6 × 10–4 = 2.4 × 10–10

[Ba+] = 4 × 10–7 M Ans.