Which is a precipitation reaction? 2Cr(s) + 6HNO_3 (aq) rightarrow 2Cr(NO_3)_3 (

Question

Which is a precipitation reaction? 2Cr(s) + 6HNO_3 (aq) rightarrow 2Cr(NO_3)_3 (aq) + 3H_2(g) H_3PO_4 (aq) + 3KOH(aq) rightarrow K_3PO_4 (aq) + 3H_2O(l) 3Ba(NO_3)_2 (aq) + 2Na_3PO_4 (aq) rightarrow Ba_3(PO_4)_2 (s) + 6NaNO_3 (aq) NaHCO_3 (aq) + HCl (aq) rightarrow NaCl (aq) + CO_2 (g) + H_2O (l) What is the net ionic equation for the reaction of aqueous solutions of Pb(NO_3)_2 and KCl? Pb^2+ (aq) + Cl^- (aq) rightarrow PbCl_2 (s) Pb^2+ (aq) + 2Cl^- (aq) rightarrow PbCl_2 (s) Pb(NO_3)_2 (aq) + 2KCl (aq) rightarrow 2KNO_3 (aq) + PbCl_2 (s) 2K^+ (aq) + 2Cl^- (aq) + Pb^2+ (aq) + 2NO^-_3 (aq) rightarrow 2K^+ (aq) + 2NO^-_3(aq) + PbCl_2 (s) From these measurements, we can conclude any acid was added solutions 1 and 3 are buffers but greater buffer capacity than 1. solutions 2 and 4 are buffers but greater buffer capacity than 4. solutions 3 and 4 are buffers but greater buffer capacity than 3. none of the four initial solutions is a b Equal volumes of solutions of acids and the salts are mixed to prepare a buffer. The closest to 5.0 was prepared by mixing 1.0 times 10^-5 M hydrochloric acid and 0.1 0.10 M benzoic acid (K_a = 6.3 times 10^-5) sodium benzoate 0.10 M butyric acid (K_a = 1.5 times 10^-5) sodium butyrate 0.10 M formic acid (K_a = 4.3 times 10^-4) sodium formate

Explanation / Answer

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Precipitation reaction occurs in aqueous solution, which results in the formation of an insoluble product, or precipitate. A precipitate is an insoluble solid that separates from the solution.

For the 4 reactions given above, we have to look which produces a solid product.

Options A, B and D don't have a solid product so, they are not precipitation reactions

Opcion C produces a solid product (Ba3(PO4)2(s)) so. It is a precipitation reaction.

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