Question

I. Name the compound which is obtained from baking soda and is used to remove the permanent hardness of water. Ii. Write its chemical formula. Iii. What happens when it is recrystallised from its aqueous solution?

Answer 1

The compound obtained from baking soda, used to remove permanent hardness of water is sodium carbonate(Na2CO3)

chemical formula: Na2CO3

it is obtained by heating baking soda

Na2HCO3---------> Na2CO3 + H2O +CO2

recrystallisation of sodium carbonate gives us washing soda

Na2CO3 + 10H2O ------------> Na2CO3.10H2O

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