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What is the formula of washing soda?

Answer and explanation

Correct answer: Na₂CO₃·10H₂O

Washing soda is the common name for hydrated sodium carbonate. The sodium carbonate part is Na₂CO₃, and the crystal contains ten molecules of water of crystallisation, so its complete formula is Na₂CO₃·10H₂O. Sodium bicarbonate, NaHCO₃, is baking soda. CaSO₄·½H₂O is plaster of Paris, whereas CaSO₄·2H₂O is gypsum. Hence option A is unambiguously correct.

Related tags

Washing-SodaChemical-FormulaHydrated-SaltAcids-Bases-SaltsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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