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calcium
Ca^2+
iron (ii)
Fe^2+
Copper (ii)
Cu^2+
Aluminium
Al^3+
Iron(iii)
Fe^3+
Ammonium
NH4+
oxide
O^2-
hydroxide
OH-
Nitride
N^3-
Carbonate
CO3
Sulphate
SO4^2-
Nitrate
NO3-
Hydrogen Carbonate
HCO3-