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Which chemical formula represents washing soda, used for washing clothes and softening hard water?

Answer and explanation

Correct answer: Na₂CO₃·10H₂O

Washing soda is sodium carbonate decahydrate, whose chemical formula is Na₂CO₃·10H₂O. The dot and the coefficient 10 show that each formula unit contains ten molecules of water of crystallisation; “deca” means ten. NaHCO₃ is baking soda, CaOCl₂ is bleaching powder, and CaSO₄·½H₂O is Plaster of Paris. Therefore option B is correct.

Related tags

ScienceClass10Acids-Bases-SaltsWashing-SodaHydrated-SaltsHard-WaterAcidsBasesAnd SaltsAcids Bases And Salts

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