Which pair of reactants will produce a precipitate when mixed together? A)HCl(aq)and NaOH(aq) B)HCl(aq)and Na₂CO₃(aq) C)HCl(aq)and Na₂S(aq) D)HCl(aq)and Pb(NO₃)₂(aq)

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In option D, the reactants are HCl(aq) and Pb(NO3)2(aq), where HCl is hydrochloric acid and Pb(NO3)2 is lead(II) nitrate. When these two solutions are mixed, lead chloride (PbCl2) precipitates out as a solid. This is because the Cl- ions from HCl(aq) combine with the Pb2+ ions from Pb(NO3)2(aq) to form insoluble PbCl2(s). In options A, B, and C, there are no combinations of ions that would create a precipitate when mixed.

Which Pair of Reactants Will Produce a Precipitate When Mixed