Le Chatelier's Principle:

The effect of temperature on solubility could be explained on the basis of Le Chatelier's Principle. Le Chatelier's Principle states which if a stress (for instance, pressure, heat, concentration of one reactant) is applied to equilibrium, a system will adjust, if possible, for minimize the effect of the stress.  This principle is of value within predicting how much a system will respond to modifications in external conditions.  Let's consider the case where the solubility procedure is endothermic (heat added).

Solid +heat ↔ solution

An increase within temperature puts a stress on the equilibrium condition and causes it to shift to the right.  A stress is relieved since the dissolving procedure consumes a few of the heat. Thus, the solubility (concentration) increases along with a raised in temperature. If the procedure is exothermic (heat given off).

Solid ↔ solution +   heat

A temperature increased will decrease the solubility through shifting the equilibrium to the left.

How much solute is dissolved within a solution is extremely important while the solution is being made for an exact use. For say there is a lot, a little, or a bit would not be extremely accurate if a specific concentration is needed.  There are a few general and accurate methods used to express concentration.  Those are density, normality, molarity, and parts per million.