Question

Washing Soda is the common name for
A.Calcium carbonate
B.Magnesium carbonate
C.Sodium carbonate
D.Potassium carbonate

Answer 1

Hint: Washing soda is a chemical compound which can be used to remove stains from the laundry and is an important ingredient for powder, liquid, or single pod formulations in the most homemade washing detergent. It is also used for treating hard water and industrial detergent mixtures. It is produced in large quantities from sodium chloride and limestone by the Solvay process.

Complete answer:
Washing Soda is the common name for sodium carbonate, \[N{a_2}C{O_3}.10{H_2}O\]. It is also known as soda ash or soda crystals. is the inorganic compound with the formula \[N{a_2}C{O_3}\] and its various hydrates. All the forms of washing soda are white in colour, it is an odourless and water-soluble salt that yields moderately alkaline solution in water.
It is the most common hydrate of sodium carbonate containing \[10\] molecules of water of crystallization. Soda ash is dissolved in water and crystallized to get washing soda.
\[N{a_2}C{O_3} + 10{H_2}O \to N{a_2}C{O_3}.10{H_2}O\]
Washing soda is used as a cleansing agent for domestic purposes. It is used for removing temporary and permanent hardness of water. It is also used in the manufacture of glass, soap and paper sodium compounds like borax.

Note:
Sodium carbonate is obtained as three hydrates and as the anhydrous salt:
-sodium carbonate decahydrate (natron), \[N{a_2}C{O_3}.10{H_2}O\], which readily effloresce to form the monohydrate.
-sodium carbonate heptahydrate (not known in mineral form), \[N{a_2}C{O_3}.7{H_2}O\].
-sodium carbonate monohydrate (thermonatrite), \[N{a_2}C{O_3}.{H_2}O\]. Also known as crystal carbonate.
-anhydrous sodium carbonate, also known as calcined soda, is formed by heating the hydrates. It is also formed when sodium hydrogen carbonate is heated (calcined).