Equation and purpose
Solubility product for sparingly soluble salt.
\[K_{sp}=[A^+]^a[B^-]^b\]
Solubility product for sparingly soluble salt.
REARRANGEMENTS
$s = (Ksp/(a^a b^b))^{1/(a+b)}$ for simple stoich.
Dimensional check: M^{a+b} ✓
Variables and units
| Symbol | Quantity | Unit | Notes |
|---|---|---|---|
| Ksp | Ksp | — | — |
| [ion] | [ion] | — | — |
Conditions and limitations
Pure solid omitted; at saturation.
Worked example
AgCl: Ksp=[Ag+][Cl−].
Ksp Expression
Solubility product for sparingly soluble salt.
Equation
Inline: $K_{sp}=[A^+]^a[B^-]^b$$
Variables
| Symbol | Quantity | Unit | Notes |
|---|---|---|---|
| solubility product | — | — | |
| ion concentration | M | — |
Conditions and limitations
Pure solid omitted; at saturation.
Rearrangements
for simple stoich.
Dimensional check: M^{a+b} ✓
Worked example
AgCl: Ksp=[Ag+][Cl−].
Steps: write equation → substitute with units → check dimensional consistency → report with correct significant figures.
Common errors
- Including solid in expression
Related resources
- solubility-precipitation topic
- Calculators — linked only when a real calculator implements this formula.
- Constants — sourced constants with version when values are required.
Sources
- NIST Physical Constants 2022 — CODATA.
Reviewed 2026-08-21 by Editorial Team; due 2027-08-21.
Common errors
- Including solid in expression
RELATED FORMULAS
C
Chemistry Fundamentals Editorial TeamAuthor
E
Editorial Review BoardReviewer
Editorial Team — transparent review placeholder
Reviewed August 21, 2026
SOURCES
- [nist-2022]NIST Physical Constants 2022 (2022). NISThttps://physics.nist.gov/constants