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Why is the reaction between barium chloride and sodium sulphate classified as both a double-displacement and a precipitation reaction?

Answer and explanation

Correct answer: Because ions are exchanged and an insoluble precipitate of barium sulphate forms.

The reaction is \(\mathrm{BaCl_2(aq) + Na_2SO_4(aq) \rightarrow BaSO_4(s) + 2NaCl(aq)}\). The \(\mathrm{Ba^{2+}}\) and \(\mathrm{Na^+}\) ions exchange anionic partners, so it is a double-displacement reaction. The product \(\mathrm{BaSO_4}\) is an insoluble solid that separates as a precipitate, so it is also a precipitation reaction. Unlike option B, no oxidation or reduction occurs in this reaction.

Related tags

ScienceClass 10Chemical ReactionsDouble DisplacementPrecipitation ReactionBarium Sulphate

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