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28 April, 12:05

Determine the molar solubility of pbso4 in pure water. ksp (pbso4) = 1.82 * 10-8.

a. 1.82 * 10-8 m

b. 1.35 * 10-4 m

c. 9.1 * 10-9 m

d. 3.31 * 10-16 m

e. 4.48 * 10-4 m

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  1. 28 April, 12:27
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    When PbSO₄ is added it dissociates as follows

    PbSO₄ - - > Pb²⁺ + SO₄²⁻

    molar solubility is the number of moles of solute that can be dissolved in 1 L of solution

    if molar solubility of PbSO₄ is X, then molar solubility of Pb²⁺ is X and SO₄²⁻ is X

    the formula for ksp is as follows

    ksp - solubility product constant

    ksp = [Pb²⁺][SO₄²⁻]

    ksp = X * X

    ksp = X²

    ksp = 1.82 x 10⁻⁸

    X² = 1.82 x 10⁻⁸

    X = 1.35 x 10⁻⁴ M

    molar solubility of PbSO₄ is 1.35 x 10⁻⁴ M

    answer is b.
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