# Solubility Product Ksp ↔ Solubility Ksp ↔ molar solubility in either direction for 1:1, 1:2, 1:3 and 2:3 salts, with optional g/L output. > Canonical page: https://elysiatools.com/en/tools/solubility-product-ksp - **Category:** Science & Education - **Keywords:** solubility product, ksp, molar solubility, ksp to solubility, solubility to ksp, 4s cubed ## Overview The Solubility Product Ksp ↔ Solubility tool converts between solubility product constants (Ksp) and molar solubility across common ionic salt stoichiometries, including 1:1, 1:2, 1:3, and 2:3 compounds. It supports bidirectional calculation, customizable solubility units (M, mM, and µM), and optional molar mass input to compute mass solubility in g/L. ## Inputs - **Direction** (select) - **Salt stoichiometry** (select) - **Solubility product Ksp** (number): e.g. 1.8e-10 for AgCl - **Molar solubility s** (number): e.g. 0.25 (mmol/L for CaF₂) - **Solubility unit** (select) - **Molar mass M (g/mol, optional)** (number): e.g. 143.32 for AgCl ## When to use - Determining molar solubility and saturated ion concentrations from an experimental or tabulated Ksp value. - Calculating the solubility product constant Ksp from known molar solubility measurements in M, mM, or µM. - Converting molar solubility into mass concentration (g/L) using a compound's molar mass. ## How it works - Select the calculation direction: Ksp → molar solubility (s) or molar solubility (s) → Ksp. - Choose the salt stoichiometry: AB (1:1), AB₂/A₂B (1:2), AB₃/A₃B (1:3), or A₂B₃/A₃B₂ (2:3). - Enter the known Ksp or molar solubility value with its corresponding concentration unit. - Optionally enter the molar mass (g/mol) to calculate equilibrium mass solubility in g/L. ## Use cases - Chemistry students verifying homework problems involving equilibrium expressions and saturated solution concentrations. - Laboratory researchers checking precipitation thresholds and dissolution limits of sparingly soluble salts. - Environmental scientists calculating aqueous metal ion saturation levels from standard solubility constants. ## Frequently asked questions ### What salt stoichiometries are supported by this calculator? The calculator supports AB (1:1, Ksp = s²), AB₂ or A₂B (1:2/2:1, Ksp = 4s³), AB₃ or A₃B (1:3/3:1, Ksp = 27s⁴), and A₂B₃ or A₃B₂ (2:3/3:2, Ksp = 108s⁵). ### Can I input molar solubility in units other than mol/L? Yes, you can enter or receive molar solubility in Molarity (M, mol/L), Millimolarity (mM, mmol/L), or Micromolarity (µM, µmol/L). ### How does the tool calculate mass solubility in g/L? When an optional molar mass (g/mol) is provided, the tool multiplies the molar solubility (in mol/L) by the molar mass. ### Does this calculation account for common-ion effects or complex ion formation? No, it computes standard equilibrium solubility in pure water based on the stoichiometric dissolution equilibrium. ### How do I enter scientific notation for very small Ksp values? 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