Do solubilty of salts increase as temperature increases?

The solubility of most but not all salts increases with increasing temperature of the solution. If the dissolution of the solute is strongly exothermic, as with calcium oxide, the solubility decreases with temperature. Sodium chloride's solubility is little changed with temperature. If the dissolution of a salt is endothermic, the solubility of that salt will increase with temperature, and the dissolution of most salts is at least mildly endothermic.