1.

How would you prepare the following?(i) Sodium thiosulphate from sodium carbonate (ii) Sodium carbonate from sodium chloride(iii) Microcosmic salt from disodium hydrogen phosphate

Answer»

Solution : (i) SODIUM carbonate is first converted into sodium sulphite by passing sulphur dioxide
`Na_(2)CO_(3) +SO_(2)to Na_(2)SO_(3)+CO_(2)`
The solution of `Na_(2)SO_(3)` is then boiled with sulphur for TWO hours.
`Na_(2)SO_(3)+StoNa_(2)S_(2)O_(3)`
(ii) The conversion is made by Solvay process
`CO_(2)+NH_(3)+H_(2)OtoNH_(4)HCO_(3)`
`NH_(4)HCO_(3)+NaClto NaHCO_(3)+NH_(4)CI`
`2NaHCO_(3)toNa_(2)CO_(3)+H_(2)O+CO_(2)`
(iii) It is prepared by DISSOLVING NH4Cl in disodium HYDROGEN phosphate in molecular proportion in hot water. `NH_(4)CI+Na_(2)HPO_(4)toNaNH_(4)HPO_(4)+NaCI`


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