Question

1. Draw a labelled diagram for the laboratory preparation of
hydrogen chloride gas and answer the following.
(a) Name the acid used. Why is this particular acid preferred to other acid
b) Give the balanced equation for the reaction.
(c) Name the drying agent used in drying hydrogen chloride gas.
(d) Phosphorus pentoxide and calcium oxide are good
drying agents but they cannot be used to dry hydrogen
chloride gas. Why?
(e) Why is direct absorption of HCl gas in water not
feasible ?
(f) What arrangment is done to dissolve HCl gas in
water?​

Answer 1

Explanation:

a. Concentrated H2SO4

b. The balanced equation for the reaction: NaCl space space plus space space straight H subscript 2 SO subscript 4 space rightwards arrow with less than 200 to the power of 0 straight C on top space NaHSO subscript 4 plus space HCl space

c. The drying agent used in drying hydrogen chloride gas is conc. sulphuric acid.

d. Phosphorous pentoxide and calcium oxide are good drying agents, but they cannot be used to dry hydrogen chloride gas because they react with hydrogen chloride.

e. Hydrogen chloride gas is highly soluble in water. Therefore, it is not collected over water.

f. The funnel arrangement is done to dissolve HCl gas in water.