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Question

Name the compound whose one formula unit is associated with 10 water molecules. How is it prepared? Give equations of related reactions. Give two uses of the compound.

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Solution

The compound is sodium carbonate decahydrate (Na2CO3.10H2O) also called washing soda.

It is prepared by Solvay process.The reactions involved are:

NaCl + CO2 + NH3 + H2O → NaHCO3 + NH4Cl

2 NaHCO 3 → Na2CO3 + CO2 + H2O

Na2CO3 + 10H20 → Na2CO3.10H2O

Uses:

It is used in paper industry

It is used for softening of water


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