Sammy Victor answered 10/8/2009 When Sodium Carbonate And Lead II Nitrate Mix, What Does It Form? Na2CO3 + Pb(NO3)2 ------ 2 NaNO3 + PbCO3 When Sodium trioxocarbonate react with Lead ll Nitrate, it will form a lead carbonate precipitate and sodium trioxonitrate V solution since all Nitrate are soluble