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23 May, 20:06

The ksp of cobalt (ii) carbonate, coco3, is 1.0 * 10-10. calculate the solubility of this compound in g/l.

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  1. 23 May, 20:23
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    When Cobalt carbonate dissolves in water it dissociates as follows;

    CoCO₃ - - > Co²⁺ + CO₃²⁻

    if the molar solubility of CoCO₃ is x then solubility of Co²⁺ is x and CO³⁻ is x as well.

    Molar solubility is the number of moles of solute that are dissolved in 1 L of solution.

    the formula for solubility product constant - ksp is as follows

    ksp = [Co²⁺][CO₃²⁻]

    ksp = x²

    ksp = 1.0 x 10⁻¹⁰

    x² = 1.0 x 10⁻¹⁰

    x = 1.0 x 10⁻⁵

    therefore molar solubility of CoCO₃ is 1.0 x 10⁻⁵M

    molar mass of CoCO₃ is 119 g/mol

    therefore solubility of CoCO₃ is 119 g/mol x 1.0 x 10⁻⁵ mol/L = 1.19 x 10⁻³ g/L
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