Question

The solubility of sodium chloride in water increases with the rise in temperature while that of lithium carbonate decreases. Assign reason for this

Answer 1

Gases are usually more soluble at lower temperature, in fact there are some solid substances the show this behavior too. The classical example is Cerium IIIsulphateCerium IIIsulphate Ce2(SO4)3Ce2(SO4)3. This behavior is due to the fact that Ce2(SO4)3Ce2(SO4)3 has an exothermic Heat of Solution. So for the principle of Le Chatelier increasing the temperature cause a decrease of the solubility of the salt that tend to compensate the increment of temperature absorbing energy through the formation of a precipitate, that in this case is an endothermic process.

Answer 2

Answer:When sodium chloride is dissolved in water, the process is endothermic in nature. This means that heat energy is absorbed in the process. Therefore, solubility increases with rise in the temperature. In case of lithium carbonate, the process of dissolution is exothermic. This means that heat is evolved in the process. Therefore, its solubility in water decreases with rise in temperature.

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