Correct: sodium Na+, calcium Ca2+, aluminium Al3+, oxide O-2, chloride Cl-, sulfide S-2, carbonate CO32-, sulfate SO42-, hydroxide OH-, hydrogen carbonate HCO3-, nitrate NO3-, hydrogen H+, potassium K+, magnesium Mg2+, iron lll Fe3+, copper ll Cu2+, iron ll Fe2+, Zinc Zn2+, silver Ag+, ammonium NH4+, Incorrect: sodium Na-, magnesium Mg+3, carbonate CO3-, hydroxide OH-2, sulfide SO42-, hydrogen carbonate HCO3, oxide O2-, sulfate S2-, nitrate N3-, potassium P3-, iron lll Fe3+, magnesium Mn2+,
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