The formula of iron (III) sulphate is _____________.

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Solution

Iron(III) sulphate:
Iron(III) sulphate has a yellow colour and is water-soluble.
It can be found in a range of minerals, but it is most commonly found in marcasite and pyrite.
Ferric sulphate is most commonly extracted from nature, but it can also be made by heating ferrous sulphate with sulphuric acid.
Therefore there must be $2$ atoms of Fe and $3 S O_{4}$ units in the formula.
Formula of Iron(III)sulphate by the crisscross method
Therefore, the formula of iron (III) sulphate is ${Fe}_{2} {({SO}_{4})}_{3}$ .

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