Look at the dissolution of various salts. Compare the dissolution of sodium hydroxide with that of sodium chloride. a) How do the energy changes for the overall processes compare?
b) Discuss the difference in magnitude of each of the three steps for dissolution of the two compounds.
The exact values vary from source to source, but typical values are as follows:
(a) Enthalpy of solution: NaCl +5 kJ/mol; NaOH -43 kJ/mol
(b) Lattice enthalpy: NaCl +771 kJ/mol; NaOH +883 kJ/mol (this enthalpy ...
Firstly we determine the enthalpy for the solution. The second and third steps are hydration of the anion and cation.