Question

The formula of iron (III) sulphate is _____________.

Answer 1

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 $3S{O}_4$ units in the formula.

Formula of Iron(III)sulphate by the crisscross method

Therefore, the formula of iron (III) sulphate is ${\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3$.