<P> which is a deviation from the real solubility (240 g / L) of 11% . This error can be reduced when an additional heat capacity parameter is taken into account . </P> <P> At equilibrium the chemical potentials for the pure solvent and pure solid are identical: </P> <Dl> <Dd> μ s o l i d ∘ = μ s o l u t i o n ∘ (\ displaystyle \ mu _ (solid) ^ (\ circ) = \ mu _ (solution) ^ (\ circ) \,) </Dd> </Dl> <Dd> μ s o l i d ∘ = μ s o l u t i o n ∘ (\ displaystyle \ mu _ (solid) ^ (\ circ) = \ mu _ (solution) ^ (\ circ) \,) </Dd>

Is q positive or negative for a melting solid and for a freezing liquid