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Karnataka Board PUCPUC Science 2nd PUC Class 12

Solubility

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Estimated time: 6 minutes
Maharashtra State Board: Class 12

Definition: Solubility

It is defined as the amount of solute that can be dissolved in 100 g of the solvent at the given conditions. It is also expressed as the maximum quantity of solute moles that can be dissolved in solvent to form 1 dm³ of solution.

Maharashtra State Board: Class 12

Key Points: Solubility

Factors Affecting Solubility

Factor Effect
Nature of solute & solvent "Like dissolves like" — similar chemical character dissolves easily
Temperature (solid in liquid) Endothermic: solubility increases with T; Exothermic: solubility decreases with T
Temperature (gas in liquid) Solubility decreases with increase in temperature
Pressure (solid/liquid in liquid) No effect (incompressible)
Pressure (gas in liquid) Solubility increases with increasing pressure
Maharashtra State Board: Class 12

Law: Henry's Law

Statement: The solubility of a gas in a liquid is directly proportional to the pressure of the gas over the solution.

S = KH⋅P

Where S = solubility (mol L⁻¹), P = pressure (bar), KH = Henry's law constant (mol L⁻¹ bar⁻¹).

Gases like NH₃ and CO₂ do NOT obey Henry's law (they react with water).

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