Question

Which of the following is an Aqueous Solution of Washing Soda? And why?

ⓐ $Na_{2}Co_{3}$ (aq)

ⓑ $Na_{2}Co_{3} . 10H _{2} O$ (aq)


☆Answer with Explaination!!!☆


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Answer 1

Na₂CO₃.10H₂O [ Sodium Carbonate decahydrate] , can be called as an aqueous solution of washing soda/Sodium Carbonate [ Na₂CO₃ ].

In Na₂CO₃.10H₂O , '10.H₂O' represents that Sodium Carbonate is hydrated/crysrallized with water. It also shows that 10 water molecules are trapped in the lattice structure of Sodium Carbonate.

Some Extra Information :-

When baking soda/Sodium bi-carbonate is heated, we obtain Sodium Carbonate.

The balanced chemical reaction is :-

2NaHCO₃ → Na₂CO₃ + H₂O + CO₂

After, that Sodium Carbonate is crystallized by adding water to get Sodium Carbonate decahydrate [Na2CO3.10H2O] :-

Na₂CO₃ + 10H₂O → Na₂CO₃.10H₂O