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Write a note on preparation of hydrogen ...

Write a note on preparation of hydrogen chloride and state its uses.

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Preparation : In laboratory, it is prepared by heating sodium chloride with concentrated sulphuric acid.
`NaCl + H_(2)SO_(4) overset(420 K) to NaHSO_(4) + HCl`
`NaHSO_(4) + NaCl overset(823 K) to Na_(2)SO_(4) + HCl`
HCl gas can be dried by passing through concentrated sulphuric acid. Davy in 1810 showed that HCl is a compound of hydrogen and chlorine and Glauber prepared this acid in 1648 by heating common salt with concentrated sulphuric acid.
(ii) Uses : In manufacture of chlorine, `NH_4Cl` and glucose (from corm starch).
For extracting glue from bones and purifying bone back.
In medicine and as a laboratory reagent.
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