Writing Formulae

Writing formulae

In Introducing Physical and Chemical Change, we learnt about the writing of chemical formulae. The table below shows some of the common anions and cations that you should know.

 Name of compound ion formula Name of compound ion formula Acetate (ethanoate) $$\text{CH}_{3}\text{COO}^{-}$$ Manganate $$\text{MnO}_{4}^{2-}$$ Ammonium $$\text{NH}_{4}^{+}$$ Nitrate $$\text{NO}_{3}^{-}$$ Carbonate $$\text{CO}_{3}^{2-}$$ Nitrite $$\text{NO}_{2}^{-}$$ Chlorate $$\text{ClO}_{3}^{-}$$ Oxalate $$\text{C}_{2}\text{O}{4}^{2-}$$ Chromate $$\text{CrO}_{4}^{-}$$ Oxide $$\text{O}_{2}^{-}$$ Cyanide $$\text{CN}^{-}$$ Permanganate $$\text{MnO}_{4}^{-}$$ Dihydrogen phosphate $$\text{H}_{2}\text{PO}_{4}^{-}$$ Peroxide $$\text{O}_{2}^{2-}$$ Hydrogen carbonate $$\text{HCO}_{3}^{-}$$ Phosphate $$\text{PO}_{4}^{3-}$$ Hydrogen phosphate $$\text{HPO}_{4}^{3-}$$ Phosphide $$\text{P}^{3-}$$ Hydrogen sulphate $$\text{HSO}_{4}^{-}$$ Sulphate $$\text{SO}_{4}^{2-}$$ Hydrogen sulphite $$\text{HSO}_{3}^{-}$$ Sulphide $$\text{S}^{2-}$$ Hydroxide $$\text{OH}^{-}$$ Sulphite $$\text{SO}_{3}^{2-}$$ Hypochlorite $$\text{ClO}^{-}$$ Thiosulphate $$\text{S}_{2}\text{O}_{3}^{2-}$$

Table: Table showing common compound ions and their formulae

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This is a lesson from the tutorial, Bonding and Atomic Combinations and you are encouraged to log in or register, so that you can track your progress.