Sodium Acetate is widely used in hot packs due to the fact that it produces an exothermic reaction when it reacts with water.
I decided to see if other sodium salts, such as sodium bromide, sodium sulphate, etc. would produce similar exothermic reactions in hopes of finding a potential substitute for sodium acetate.
Is there a reason why some of these sodium salts would react with water to produce a larger enthalpy change than others? Is this predictable given the molecules' properties and/or geometry? Can enthalpy change at all be predicted given every property we currently know about these molecules?