The mixing of which pair of reactants will result in a precipitation reaction? A)CsI(aq)+ NaOH(aq) B)HCl(aq)+ Ca(OH)₂(aq) C)K₂SO₄(aq)+ Hg₂(NO₃)₂(aq) D)NaNO₃(aq)+ NH₄Cl(aq)

Question

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Choice C involves the mixing of potassium sulfide and mercury (II) sulfide which will yield a precipitate of mercury (II) sulfide. A precipitation reaction occurs when two aqueous solutions are mixed, and a solid substance is formed, which is insoluble in water. All the other choices result in the formation of soluble products, and hence there will be no precipitation reaction.

The Mixing of Which Pair of Reactants Will Result in a Precipitation