Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of magnesium bromide and ammonium sulfide are combined. Be sure to specify states such as (aq) or (s). If a box is not needed leave it blank. (a) When aqueous solutions of Pb(NO3)2 and BaBr2 are mixed, does a precipitate form? (b) Write a balanced equation for the precipitation reaction that occurs when aqueous solutions of calcium chloride and potassium carbonate are combined. Be sure to include states such as (s) or (aq)