Chemistry
For the preparation of hydrochloric acid in the laboratory —
(i) State why direct absorption of hydrogen chloride gas in water is not feasible.
(ii) State what arrangement is used to dissolve hydrogen chloride gas in water.
Hydrogen Chloride
ICSE 2018
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Answer
(i) Hydrogen chloride gas is sufficiently soluble, so, it is absorbed more quickly than it is being generated in the flask. This causes back-suction due to partial vacuum created in the tube. Hence, direct absorption of hydrogen chloride gas in water is not feasible.
(ii) A special funnel arrangement is done in which an inverted funnel, connected to the hydrogen chloride gas supply is placed in the beaker in such a way that it just touches the water taken in the trough. This arrangement minimizes back suction.
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