The diagram shows the enthalpy changes when sodium chloride is dissolved in water.

a. Define the following terms:

i. Enthalpy change of solution

ii. Enthalpy change of hydration.

b. Write symbol equations that describe the following:

i. Enthalpy change of solution of sodium chloride

ii. Enthalpy change of hydration of the chloride ion.

c. Name the enthalpy changes labelled a, B and C.

d. Draw the water molecules around magnesium ions and sulfate ions in a solution of magnesium sulfate.

e. Explain, in terms of differences of lattice energies and enthalpy changes of hydration, why magnesium sulfate is more soluble in water than calcium sulfate.

Transcribed Image Text:

Na* (8) + CI (g) A B enthalpy Na* (aq) + CI"(aq)