8.2 Heat of solutions

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8.2 Heat of solutions

Heat of solutions relates to a process in which one mole of solute is dissolved in an infinitely large quantity of solvent.

Table 11

Heat of solution is the net energy required to break apart solute-solute (crystal lattice H positive) and solvent-solvent attraction or bonds and the energy released by the formation of new solute-solvent bond ( heat of hydration; H negative ).
Example: Substance	Lattice Energy Kcal/mol	Heat of Hydration Kcal/mol	Heat of Solution Kcal/mol
KC1	+ 167.6	- 163.5	+ 4.1
AgF	+ 217.7	- 222.6	- 4.9