What is the correct formula of washing soda?
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A.
Na₂CO₃.H₂O
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B.
Na₂CO₃
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C.
Na₂CO₃.6H₂O
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D.
Na₂CO₃.10H₂O
Correct Answer:
D. Na₂CO₃.10H₂O
Explanation:
The correct formula for washing soda is Na2CO3.10H2O, which corresponds to option D. Chemically known as sodium carbonate decahydrate, washing soda is a crystalline salt containing ten molecules of water of crystallization for every unit of sodium carbonate. While anhydrous sodium carbonate (Na2CO3) is called soda ash, the specific hydrated form used for domestic cleaning and laundry is the decahydrate.
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