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Question

The solubility of Ag₂SO₄ in 0.1 M Na₂SO₄ is 5.0 × 10⁻⁵ M . What is its Ksp ?

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Explanation

For Ag₂SO₄ <=> 2Ag+ + SO₄²⁻ , [Ag+] = 2 × 5.0 × 10⁻⁵ = 1.0 × 10⁻⁴ , [SO₄²⁻] = 0.1 + 5.0 × 10⁻⁵ ≈ 0.1 . Ksp = (1.0 × 10⁻⁴)² × 0.1 = 1.0 × 10⁻⁹ .

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