Solid KF has a lattice energy of 804 kJ/mol and a heat of solution (in water) of

Question

Solid KF has a lattice energy of 804 kJ/mol and a heat of solution (in water) of -15 kJ/mol. RbF has a lattice energy of 768 kJ/mol and a heat of solution (in water) of -24 kJ/mol. Which salt forms stronger attractions with water?

A. RbF, since it has a more negative heat of hydration.

B. KF, since it has a larger lattice energy.

C. RbF, since it has a smaller lattice energy.

D. KF, since it has a more negative heat of hydration.

E. They form equally strong attractions with water, since they both have negative heats of mixing.

Explanation / Answer

Heat of hydration of a lattice is the amount of heat released when 1 mol of ionic substance is dissolve in water. The more the ion is hydrated, more amount of heat will be released. Since RbF released a greater amount of energy when dissolved in water , it has a stronger attraction with water.

Ans : option A

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