Question

Show with the help of an activity that when ammonium chloride is dissolved in water

heat is absorbed.​

Answer 1

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When ammonium chloride dissolves in water, heat is absorbed.

Thus, the dissolution of ammonium chloride is an endothermic reaction.

When the temperature of endothermic reaction is increased, the value of the equilibrium constant increases.

Hence, the solubility of ammonium chloride increases with increase in temperature.

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Answer 2

Answer:

Napthalene is insoluble in water but soluble in benzene (organic solvent). Ammonium chloride is soluble in water but insoluble in benzene. Napthalene changes into vapours at room temperature whereas ammonium chloride changes into vapours on heating.

Method :

(a) Add water to the mixture and shake it vigorously to dissolve ammonium chloride.

(b) Filter the mixture. Napthalene is obtained as residue whereas, filtrate contains ammonium chloride. Crystallize the filtrate by heating till saturated solution of ammonium chloride is obtained.

(c) Cool the hot saturated solution to get crystals of ammonium chloride.

solution

Explanation:

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