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ICSE Class 10 Chemistry Question 12 of 53

Study of Compounds — Hydrogen Chloride — Question 7

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Question

Question 7

In the laboratory preparation of hydrochloric acid, hydrogen chloride gas is dissolved in water.

(a) Draw a diagram to show the arrangement used for the absorption of HCl gas in water.

(b) State why such an arrangement is necessary. Give two reasons for the same.

(c) Write balanced chemical equations for the laboratory preparation of HCl gas when the reaction is :

    (A) below 200°C

    (B) above 200°C

Answer

(a) Below diagrams show the special funnel arrangement used for the absorption of HCl gas in water:

Draw a diagram to show the arrangement used for the absorption of HCl gas in water. Study of Hydrogen Chloride, Simplified Chemistry Dalal Solutions ICSE Class 10.
Draw a diagram to show the arrangement used for the absorption of HCl gas in water. Study of Hydrogen Chloride, Simplified Chemistry Dalal Solutions ICSE Class 10.

(b) The reasons are :

  1. Prevents or minimizes back-suction of water.
  2. Provides a large surface area for the absorption of the HCl gas.

(c) The equations are:

(A) NaCl+H2SO4→<200°CNaHSO4+HCl [g]\text{NaCl} + \text{H}_2\text{SO}_4 \xrightarrow{\lt 200 \degree\text{C}} \text{NaHSO}_4 + \text{HCl [g]} ↑

(B) 2NaCl+H2SO4→>200°CNa2SO4+2HCl [g]\text{2NaCl} + \text{H}_2\text{SO}_4 \xrightarrow{\gt 200 \degree\text{C}} \text{Na}_2\text{SO}_4 + \text{2HCl [g}] ↑