Which chemical equations show a precipitation reaction? Use the solubility rules to help you. Select all the correct answers. Ca(NO3)2 MnSO4 → CaSO4 Mn(NO3)2 MgBr2 2KCl → MgCl2 2KBr 2NaOH MgCl2 → 2NaCl Mg(OH)2 3FeCl2 2AlBr3 → 3FeBr2 2AlCl3 2HI ZnBr2 → 2HBr ZnI2