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Question:

Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.2 × 10⁻⁸ mol L⁻¹. Solubility product of Ag2C2O4 is ___________.

4.5 × 10⁻¹

2.42 × 10⁻¹⁰

5.3 × 10⁻¹²

2.66 × 10⁻¹²

Solution:

[Ag+] = 2.2 × 10⁻⁸ mol L⁻¹
[C2O4²⁻] = 0.5[Ag+] = 0.5 × 2.2 × 10⁻⁸ mol L⁻¹ = 1.1 × 10⁻⁸ mol L⁻¹
Ksp = [Ag+]²[C2O4²⁻]
Ksp = (2.2 × 10⁻⁸ mol L⁻¹)² × 1.1 × 10⁻⁸ mol L⁻¹
Ksp = 5.3 × 10⁻²⁴