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van't Hoff's equation

equation for osmotic pressure of dilute solutions.

See: van't Hoff's law.

For any reaction, d(ln Keq/d(1/T) equals -dH/R where keq is the equilibrium constant, T the absolute temperature, R is the universal gas constant, and dH is the change in enthalpy; thus, plotting ln Keq vs. 1/T allows the determination of dH.