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  4. Sodium carbonate is prepared by Solvay process but the same process is not extended to the manufacture of potassium carbonate, explain.

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Q. Sodium carbonate is prepared by Solvay process but the
same process is not extended to the manufacture of
potassium carbonate, explain.

IIT JEEIIT JEE 1981The s-Block Elements

Solution:

In Solvay process, $NaHCO _{3}$ is extracted from the solution by fractional crystallisation, which is then heated to convert it into $Na _{2} CO _{3} \cdot KHCO _{3}$, being more soluble than $NaHCO _{3}$, cannot be extracted by fractional crystallisation. Hence, Solvay process fails in production of $K _{2} CO _{3}$.