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What is the f...

Question

What is the formula of aluminium sulphate?

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Solution

Sulphate is a polyatomic ion with formula $(S O_{4})^{2 -}$

Aluminium is a Group 3A metal that forms a 3+ cation.

A trick to balancing the charge is to use the number of the charge of one ion as the subscript on the other and vice versa.

Formula of aluminium sulphate is $A l_{2} (S O_{4})_{3}$

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