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

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.