Question

Chemical name and formula of washing soda is hydrated sodium carbonate and $ N{a_2}C{O_3}.10{H_2}O $ respectively.
(A) True
(B) False

Answer 1

Hint: Washing soda is a white, odourless inorganic compound that is hygroscopic in nature that means it absorbs moisture content present in the air. Its solubility in water is very high and it forms a powerful alkaline solution in water.

Complete step by step answer:
Washing soda is a crystalline solid with a pH value of $ 11 $ . It is known by the name of sodium carbonate decahydrate. It is the most commonly found hydrate of sodium carbonate which has $ 10 $ molecules of water of crystallization.
Its chemical formula is $ N{a_2}C{O_3}.10{H_2}O $ . It is obtained by Solvay's process which indulges the reaction of $ NaCl $ , $ N{H_3} $ and $ C{O_2} $ with water. The $ C{O_2} $ involved is produced by calcium carbonate and the calcium oxide which is left is further used in the recovery of $ N{H_3} $ from $ N{H_4}Cl $ . First, we get the sodium bicarbonate which is further converted to sodium carbonate upon heating. Finally, washing soda is obtained through recrystallization of sodium carbonate. The reactions involved are;
 $ NaCl + N{H_3} + C{O_2} + {H_2}O \to NaHC{O_3} + N{H_4}Cl $
 $ 2NaHC{O_{3}} \to N{a_2}C{O_3} + {H_2}O + C{O_2} $
 $ N{a_2}C{O_3} + {{ }}10{H_2}O \to N{a_2}C{O_3}.10{H_2}O $
Hence we can say that the chemical formula of sodium hydrated sodium carbonate is $ N{a_2}C{O_3}.10{H_2}O $ and its common name is washing soda. So, the given statement is true.
Therefore, Option (A) is correct.

Note:
The uses of washing soda are:
-It is used for removing temporary and permanent hardness of the water. It is also used in the paper, soap, and glass manufacturing industry very dominantly.
-It can also be used to remove the burnt-on grease from utensils. In homes, it is used for the purpose of washing clothes.
-It is also used as a raw material in the manufacturing of other sodium compounds like borax.