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When an aqueous solution of barium chloride is mixed with an aqueous solution of sodium sulphate, what visible change is observed?

Answer and explanation

Correct answer: A white precipitate forms

The reaction is \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). Barium sulphate, \(\mathrm{BaSO_4}\), is insoluble in water, so it appears as a white solid precipitate. Evolution of a brown gas is not a feature of this double-displacement precipitation reaction.

Related tags

Chemical ReactionsPrecipitation ReactionBarium SulphateDouble DisplacementClass 10 Science

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