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The formula of washing soda shows sodium carbonate decahydrate. What does the word decahydrate indicate?

Answer and explanation

Correct answer: Ten water molecules in the crystal

The prefix “deca-” means ten, and “hydrate” refers to water associated with a compound. Thus, sodium carbonate decahydrate, Na₂CO₃·10H₂O, contains ten water molecules of crystallisation for each formula unit of sodium carbonate. Therefore, option A is correct. The term does not indicate ten metals or ten acids, and it cannot mean that the crystal has no water. The water is present in a definite chemical ratio.

Related tags

Washing-SodaDecahydrateWater-Of-CrystallisationHydrated-SaltsClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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