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Why does a precipitate form when aqueous solutions of barium chloride and sodium sulphate are mixed?

Answer and explanation

Correct answer: Barium sulphate is insoluble in water

The reaction is \(\mathrm{BaCl_2(aq)+Na_2SO_4(aq)\rightarrow BaSO_4(s)+2NaCl(aq)}\). In solution, \(\mathrm{Ba^{2+}}\) and \(\mathrm{SO_4^{2-}}\) ions combine to form insoluble \(\mathrm{BaSO_4}\), which separates as a solid precipitate. \(\mathrm{NaCl}\) remains soluble in water, so it does not form the precipitate.

Related tags

ScienceClass10Chemical ReactionsPrecipitationDouble DisplacementSolubility

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