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25 September, 21:53

At a certain temperature, the solubility of strontium arsenate, sr3 (aso4) 2, is 0.0650 g/l. what is the ksp of this salt at this temperature?

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  1. 25 September, 22:18
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    Answer is: Ksp for strontium arsenate is 2.69·10⁻¹⁸.

    Balanced chemical reaction (dissociation):

    Sr₃ (AsO₄) ₂ (s) → 3Sr²⁺ (aq) + AsO₄³⁻ (aq).

    s (Sr₃ (AsO₄) ₂) = 0.0650 g/L.

    s (Sr₃ (AsO₄) ₂) = 0.0650 g/L : 540.7 g/mol = 1.2·10⁻⁴ mol/L.

    s (Sr²⁺) = 3s (Sr₃ (AsO₄) ₂).

    s (AsO₄³⁻) = 2s (Sr₃ (AsO₄) ₂).

    Ksp = s (Sr²⁺) ³ · s (AsO₄³⁻) ².

    Ksp = (3s) ³ · (2s) ².

    Ksp = 108s⁵.

    Ksp = 108 · (1.2·10⁻⁴ mol/L) ⁵ = 2.69·10⁻¹⁸.
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