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16 February, 14:02

The value of ksp for silver sulfide, ag2s, is 8.00*10-51. calculate the solubility of ag2s in grams per liter.

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  1. 16 February, 14:14
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    When Ag₂S dissolves, it dissociates as follows;

    Ag₂S - - - > 2Ag⁺ + S²⁻

    First we need to calculate molar solubility which gives the number of moles dissolved in 1 L of solution.

    If molar solubility of Ag₂S is y, then molar solubility of Ag²⁺ and S²⁻ is 2y and y respectively.

    ksp gives the solubility constant

    ksp = [Ag⁺]²[S²⁻]

    ksp = [2y]²[y]

    4y³ = 8.00 x 10⁻⁵¹

    y³ = 2 x 10⁻⁵¹

    y = 1.26 x 10⁻¹⁷ mol/L

    molar mass = 247.8 g/mol

    solubility of Ag₂S = 1.26 x 10⁻¹⁷ mol/L x 247.8 g/mol = 3.12 x 10⁻¹⁵ g/L

    Solubility of Ag₂S = 3.12 x 10⁻¹⁵ g/L
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