What is the composition of washing soda?

Na:C:O:H = 2:1:3:1

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Na:C:O:H = 2:1:4:2

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Na:C:O:H = 2:1:13:20

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Na:O:H =1:1:1

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Solution

The correct option is C
Na:C:O:H = 2:1:13:20

The molecular formula of washing soda is $N a_{2} C O_{3} .10 H_{2} O$ .

Number of sodium atoms = 2 , Number of carbon atom = 1

Number of oxygen atoms = 3 atoms in $N a_{2} C O_{3}$ + 10 * 1 atoms in $10 H_{2} O$ =13

Number of hydrogen atoms = 10 * 2 atoms in $10 H_{2} O$ = 20

So the ratio of sodium, carbon, oxygen and hydrogen is 2:1:13:20.

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