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Question

Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

NaHSO4H++Na+SO24

(b) Anhydrous calcium chloride is used in a desiccator.

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Solution

(a) Sodium hydrogen sulphate dissolves in water but does not produce a hydrogen ion. The reason there is a hydrogen ion is that NaHSO4 (Sodium hydrogen sulphate) still has the acidic hydrogens left from the carbonic acid. This is why sodium hydrogen sulphate can donate a hydrogen ion when reacted with a strong base. For example, if sodium hydrogen sulphate reacts with sodium hydroxide, it produces sodium sulphate and water (which has got the hydrogen ion).

(b) The purpose of using desiccators is to absorb moisture. Anhydrous calcium chloride ((\CaCl_2\)) has a capacity of absorbing moisture as it is hygroscopic in nature, so it is used as a desiccators.


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