Answer the following pertaining to the laboratory preparation of HCl. [5 marks]
(i) How HCl gas is collected?
(ii) Explain why the lower end of thistle funnel should dip in the reaction
mixture.
(iii) Name the drying agent used.
(iv) Explain why concentrated nitric acid cannot be used as a reagent.
(v) Give the identification of HCl gas.
Answers
Answer:
I) Hydrogen Chloride Gas is collected by Upward Displacement Of Air. This is because HCl gas is 1.28 times heavier than air.
ii) When we are preparing a gas in the laboratory , we keep the thistle funnel dipped in the acid because the product formed is a gas and it can mix in the air , so in order to collect the gas without wasting it , we dip the funnel into the acid solution.
iii) The drying agent used in drying hydrogen chloride gas is conc. sulphuric acid.
iv) Nitric Acid is a very strong oxidising agent. It oxidizes the Dihydrogen Gas produced during the reaction with metals to Water. That is why, Nitric Acid cannot be used for preparation of hydrogen gas.
v) The compound hydrogen chloride has the chemical formula HCl and as such is a hydrogen halide. At room temperature, it is a colourless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric water vapor.
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