Question

Molecular formula of aluminium sulphate by criss-cross method

Answer 1

Explanation:

• The “criss–cross method” is the easiest way to find the formula of any type of “ionic compound”.  

• The ionic compound has two chemical elements or sometime it has polyatomic ion as part of it.

• In this method, combining capacity value of metal atom is mentioned as subscript for non-metal atom and combining capacity value of non-metal atom is mentioned as subscript for metal atom.

• It is denoted by the formula of  $\mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}$

The criss-cross method of Aluminium sulphate is attached below: