Molar Solubility from Ksp Calculator

What this tool does

For a salt AxBy that dissolves into x cations and y anions, Ksp = (xs)^x (ys)^y, which gives the solubility s directly. That makes comparisons between salts tricky: a smaller Ksp does not always mean less soluble when the formulas differ, because the exponents differ too. The calculation assumes pure water, no common ions, no side reactions such as hydrolysis or complex formation, and ideal behaviour; real solubilities in salty or acidic water can be very different.

Formula

Ksp = (x s)^x (y s)^y ⇒ s = (Ksp ÷ (x^x y^y))^(1 ÷ (x + y))

Variables

Worked example

Limitations

• The formula assumes ideal conditions: no friction losses, no air resistance and no efficiency losses unless you enter them.
• The default values are typical reference figures, not measurements of your situation. Replace them with your own data whenever you have it.