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EAMCET Engineering 2010 Solved Paper

Section: Chemistry

Question : 129 of 160

Marks: +1, -0

Solution:

Solvay process is used in the manufacture of sodium carbonate,

\mathrm{Na}_2\mathrm{CO}_3

. This process involves following reactions.

\mathrm{NH}_3 + \mathrm{H}_2\mathrm{O} + \mathrm{CO}_2 \rightarrow \mathrm{NH}_4\mathrm{HCO}_3

\mathrm{NH}_4\mathrm{HCO}_3 + \mathrm{NaCl} \rightarrow \mathrm{NaHCO}_3 + \mathrm{NH}_4\mathrm{Cl}

\mathrm{NH}_3 + \mathrm{H}_2\mathrm{O} + \mathrm{CO}_2 + \mathrm{NaCl} \rightarrow \mathrm{NaHCO}_3

+ \mathrm{NH}_4\mathrm{Cl}

The sodium bicarbonate obtained on heating gives sodium carbonate.

\mathrm{NaHCO}_3 \xrightarrow[]{\Delta} \mathrm{Na}_2\mathrm{CO}_3 + \mathrm{H}_2\mathrm{O} + \mathrm{CO}_2

Note This process cannot be used in the manufacture of potassium carbonate as potassium bicarbonate is soluble in the solution of

\mathrm{NH}_4\mathrm{Cl}

and KCl.

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