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What visible change occurs when aqueous solutions of sodium sulphate and barium chloride are mixed?

Answer and explanation

Correct answer: A white precipitate forms

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

Related tags

ScienceClass-10Chemical-ReactionsPrecipitationDouble-DisplacementBarium-Sulphate

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