What is revealed in the reaction CaOH2s Ca2 aq 2OH-aq H -16.71?

The reaction ( \text{Ca(OH)}_2(s) \rightleftharpoons \text{Ca}^{2+}(aq) + 2 \text{OH}^-(aq) ) with a change in enthalpy (( \Delta H )) of -16.71 kJ indicates that the dissolution of solid calcium hydroxide in water is an exothermic process. This means that heat is released when calcium hydroxide dissolves, resulting in a slight increase in the temperature of the solution. The negative value of ( \Delta H ) suggests that the products (dissolved ions) are more stable than the reactant (solid calcium hydroxide) in terms of energy.