The mixing of which pair of reactants will result in a precipitation reaction? a. ba(no3)2(aq) + na2co3(aq) b. nh4br(aq) + nh4i(aq) c. k2so4(aq) + cu(no3)2(aq) d. naclo4(aq) + (nh4)2s(aq)

A. Ba(NO₃)₂(aq) + Na₂CO₃(aq)

Explanation:

The reaction between aqueous Ba(NO₃)₂ and Na₂CO₃ is a precipitation reaction.The complete equation for the reaction is;

Ba(NO₃)₂(aq) + Na₂CO₃(aq) → BaCO₃(s) + NaNO₃(aq)

Barium carbonate is the precipitate formed during the reaction.All nitrates are soluble in water and all salts of sodium are soluble in water, therefore, Ba(NO₃)₂, Na₂CO3, and NaNO₃ are soluble in water. Precipitation reaction involves reaction of soluble salts to form a precipitate as one of the product.