Which of the following ionic compounds will form a precipitate in water? a. PbCO_3. b. Na_2CO_3. c. Pb(NO_3)_2. d. Na_2NO_3. Which of the following products are insoluble in water? a. AgC2H3O2 b. MgSO4 c. Pb(NO3)2 d. Hg2CO3 e....