Number of water molecules in washing soda and soda ash respectively...

Number of water molecules in washing soda and soda ash respectively are :

Options

A $1and10$
B $10and1$
C $10and0$
D $1and0$

Correct answer

C. $10and0$

Step-by-step solution

The chemical formula for washing soda is ${Na}_{2}{CO}_{3} . 10{H}_{2}O$ , which means that each molecule of washing soda contains $10$ water molecules.

The chemical formula for soda ash is ${Na}_{2}{CO}_{3}$ , which does not contain any water molecules.

Therefore, there are $10$ water molecules in washing soda and $0$ water molecules in soda ash.

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