Grade 12 · Chemistry
The concept of solubility
Why it matters
Dissolving as a dynamic equilibrium.
Advanced20m readingPrerequisite: None
What is the solubility product (Ksp)?
Short answer
The solubility product constant, Ksp, is the equilibrium constant for a slightly soluble ionic solid dissolving in water. It equals the product of the dissolved ion concentrations, each raised to its coefficient in the dissolution equation. A larger Ksp means a more soluble salt; comparing Ksp to the reaction quotient predicts whether a precipitate forms.
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Frequently asked questions
- How is Ksp different from solubility?
- Solubility is how much dissolves; Ksp is the equilibrium constant. You can calculate one from the other using the dissolution stoichiometry.