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8.4 Effect of Temperature and Pressure on Solubility

When the solute dissolves with the absorption of heat

energy + solute + H2O saturated solution.

e.g. sodium chloride, potassium bromide.

When the solute dissolves with the evolution of heat

solute + H2O saturated solution + energy

e.g. Lithium carbonate, sodium sulphate

Thus the solubility of a solute where energy is required (former example) to shift the equilibrium to the right side, increases with increasing temperature of the solution and decreases with decreasing temperature of the solution.


The solubility of a solute where energy is liberated (latter example) during the shifting of equilibrium to the right side, increase in temperature decreases the solubility and by decreasing the temperature solubility increases.

The solubility of all the gases decreases with increase in temperature. Thus when the temperature of soft drinks is raised CO2 gas evolves as its solubility decreases in the soft drink solution.

The solubility of solid and liquid solutes have negligible effect on the pressure of a system.

But the solubility of a gas is directly proportional to the system pressure.

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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