Ionic EquilibriumHard

Question

The Ksp of Ag2CrO4 = 1.2 × 10–11. What concentration of Ag+ ion in aqueous solution will just fail to give a precipitate of Ag2CrO4 with a solution in which [CrO4–2] = 3 × 10–4 M?

Options

A.10–3 M
B.10–1 M
C.10–4 M
D.2 × 10–4 M

Solution

Ag2CrO4(s) $\rightleftharpoons$ 2Ag+ + CrO42−

To prevent ppt (backward reaction), Q ≤ Ksp

or, [Ag+] 2 × 3 × 10–4 ≤ 1.2 × 10–11

∴ [Ag+]max = 2 × 10–4 M

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