Solubility Of Benzoic Acid And Measuring The Differential Heat Of Solution
Solubility of a salt is usually known as the number of grams of the salt that will dissolve in 100 grams of water. Solubility is also defined as the maximum amount of solute dissolves in a solvent to make it a saturated solution at a particular temperature. The temperature is an important part of the solubility data because, like most chemical processes, dissolution of a salt is temperature dependent1. However, the behaviour depends on whether the solubility reaction is an exothermic reaction or an endothermic reaction. The increase in temperature will favour a solubility reaction which is an endothermic process while it will inhibit an exothermic reaction.
The solution is saturated, when a pure solid is at equilibrium with the dissolved solute in a solvent. The equilibrium constant for solubility at any temperature is as follows: K = ([solute])/([solid]) Equation 11
Usually, the concentration of the solid is constant (equal to 1), so as a result, K = [solute] = x Equation 21
The heat of solution is an enthalpy term, which is almost but not quite independent of temperature. When the heat of solution is calculated in the way using titration, the value is a good approximation of the…