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

Answer and explanation

Correct answer: 10

Washing soda has the formula \(\mathrm{Na_2CO_3\cdot10H_2O}\). The term \(10\mathrm{H_2O}\) shows that each formula unit of sodium carbonate is associated with 10 molecules of water of crystallisation. Therefore, option A is correct. Five water molecules occur in copper sulfate pentahydrate, \(\mathrm{CuSO_4\cdot5H_2O}\), not in washing soda. Exam tip: In a hydrated salt formula, the coefficient before \(\mathrm{H_2O}\) after the dot gives the number of water molecules of crystallisation.

Related tags

Washing SodaWater Of CrystallisationHydrated SaltsSodium CarbonateAcids Bases Salts

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