Chemical formula of washing soda is:

N a_{2} C O_{3}

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N a_{2} C O_{3} .10 H_{2} O

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N a_{2} C O_{3} .5 H_{2} O

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N a_{2} S O_{4} .10 H_{2} O

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Solution

The correct option is D $N a_{2} C O_{3} .10 H_{2} O$
Decahydrate of sodium carbonate is known as washing soda.
Therefore, the correct molecular formula of washing soda is ${N a}_{2} {C O}_{3} \cdot 10 H_{2} O$ .

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N a_{2} C O_{3} .10 H_{2} O

What is the chemical formula of (a) baking soda, and (b) washing soda ?

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