Chemistry

Give reasons for the following :

In the laboratory preparation of HCl acid from NaCl and conc. H2SO4, the residual salt formed at temperatures above 200°C forms a hard crust and sticks to the glass.

Hydrogen Chloride

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Answer

At temperatures above 200°C, Sodium sulphate is formed. It forms a hard crust, sticks to the glass and is difficult to remove.

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