Question

How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water that can be removed by it?

Answer 1

Washing soda is prepared from sodium carbonate by recrystallization.

\[\ce{\underset{\text{Sodium carbonate}}{Na2CO3}+{10H_2O}->\underset{\text{Washing soda}}{Na2CO3.10H2O}}\]

Washing soda is a basic salt. It is used to eliminate the permanent hardness of water.