3,classification by sulin basic ions of water have cation: Na(K+)Mg2+Ca2+ negative ion:CI SO2- HCO Na sodium K:potassium/kalium Mg2+:magnesium Ca2+:calcium Cl-:chlorine SO2-:sulfate HCO:bicarbonate3﹑classification by sulin basic ions of water have cation: Na+ (K+ ) Mg2+ Ca2+ negative ion: Cl- SO4 2- HCO3 - Na+ : sodium K+ :potassium/kalium Mg2+ : magnesium Ca2+: calcium Cl- : chlorine SO4 2- :sulfate HCO3 - : bicarbonate