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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


Index

8.1 Nature of Solution
8.2 Heat of Solutions
8.3 Concentration of Solution
8.4 Effect of Temperature and Pressure on Solubility
8.5 Boiling Point and Freezing Point of Solution

Chapter 9





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