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Common Salt

Name the comp...

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 â†’ NaHCO₃ + NH₄Cl
2 NaHCO ₃â†’ Na₂CO₃ + CO₂+ H₂O
Na₂CO₃ + 10H₂0 â†’ Na₂CO₃.10H₂O
Uses:
It is used in paper industry
It is used for softening of water

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