Work out solubility product instantly with clear inputs, formula shown and shareable results.
For a salt AxBy dissolving to give x cations and y anions, each ion's concentration is a multiple of the molar solubility, and Ksp is the product of those concentrations each raised to its own coefficient: Ksp = (xs)^x (ys)^y. The exponents are what make Ksp values for 1:2 salts look so much smaller than for 1:1 salts at similar solubility.
Solubility product
Ksp = (x.s)^x x (y.s)^y
Logarithmic form
pKsp = -log10(Ksp)
Only for a 1:1 salt. A 1:2 salt produces twice as many anions, so the anion term is (2s) and it is squared, giving Ksp = 4s^3.
No, only with temperature. That is what makes it useful for predicting whether a precipitate forms.