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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
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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 ). |
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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 |
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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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