Chemistry
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
NaHSO4 ⇌ H+ + Na+ + SO42-
(b) Anhydrous calcium chloride is used in a desiccator.
Acids Bases Salts
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Answer
(a) Sodium hydrogen sulphate [NaHSO4] is not an acid but due to the partial replacement of the replaceable hydrogen ion in a dibasic acid [H2SO4] releases a [H+] ion. Thus, we get the above equation.
Therefore, on dissolving in water, it gives hydrogen ions.
(b) Desiccating agents are used to absorb moisture. Anhydrous calcium chloride (CaCl2) has the capacity to absorb moisture as it is hygroscopic hence used as a desiccating agent.
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