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How many molecules of water of crystallisation are present in washing soda?

Answer and explanation

Correct answer: Ten

The governing concept is hydration of salts. Washing soda is sodium carbonate decahydrate, written as Na₂CO₃·10H₂O. The dot followed by 10H₂O shows that each formula unit of sodium carbonate is associated with ten water molecules of crystallisation. Therefore, option A is correct. Two, five, and half do not match the established formula of washing soda and refer to no correct hydration state here.

Related tags

Washing SodaWater Of CrystallisationSodium CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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