а) z (H2SO4) = 2, z (Ca(OH)2) = 2, z (CaSO4) = 2
б) z (Ca(OH)2) = 1, z (HCl) = 1, z (CaOHCl) = 1
в) z (H4P2O7) = 1, z (NaOH) = 1, z (NaH3P2O7) = 1