What is the solubility, in moles per liter, of BaSO₄ (K_sp = 1.1 × 10^-10), in 0.0100 M Na₂SO₄ solution?Hint: Be sure to account for the presence of a common ion. You should also be able to simplify the math because the solubility is very low.

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The solubility of BaSO₄ in the presence of a common ion (SO₄²⁻ from Na₂SO₄) is calculated using the Ksp expression: Ksp = [Ba²⁺][SO₄²⁻]. With [SO₄²⁻] = 0.0100 M, the solubility of Ba²⁺ is Ksp / [SO₄²⁻] = 1.1 × 10⁻¹⁰ / 0.0100 = 1.1 × 10⁻⁸ M.

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What Is the Solubility, in Moles Per Liter, of BaSO₄