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Question

(a) Draw a labelled diagram for the laboratory preparation of hydrogen chloride gas.
(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?

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Solution

a)

b)Balanced equation:

NaCl+H2SO4200oC−−NaHSO4+HCl


c)Hydrogen chloride is dried by passing through conc. Sulphuric acid


d) Phosphorous pentoxide and CaO cannot be used to dry HCl because they react with HCl.

2P2O5+3HClPOCL3+3HPO3

CaO+2HClCaCl2+H2O


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