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# Solubility Product Constants

## The equilibrium constant, Ksp, for aqueous solutions of ionic compounds at 25°C.

For ionic compounds with limited solubility in water, an equilibrium constant, K sp , can be defined from the ion concentration in water from the equation:

M m A n (s) = m M n+ (aq) + n A m- (aq)

where M m A n is the slightly soluble substance and M n+ and A m- are the ions produced in solution by dissosiation of M m A n .

K sp = [M n+ ] m * [A m- ] n

The table below gives calculated values of K sp for common ionic substances at 25°C (77°F). They are calculated by using standard state thermodynamic data and the equations:

Δ = m f G °(M + , aq) + n f (A - , aq) - Δf (M m A n , s)        and       ln K sp = -Δ G°/RT

K sp is indicating the maximum concentration of the solved ionic substace in water at the actual (stable) temperature.

For sulfides , a K spa is defined based on the equation

M m S n (s) + 2H + = m M + (aq) + n H2S(aq)

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## Citation

• The Engineering ToolBox (2017). Solubility Product Constants. [online] Available at: https://www.engineeringtoolbox.com/solubility-product-equilibrium-constant-ionic-solution-salt-Ksp-d_1952.html [Accessed Day Month Year].

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4.10.13

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