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QUESTION

What is the formula of aluminum carbonate?

Al_2(CO_3)_3

Use the criss cross method.

Aluminium=Al^-3 Valency=3(Valency is always positive)

Carbonate=CO_3^-2 Valency=2(Valency is always positive)

So,The valencies interchange:

So,at the end we write the formula as Al_2(CO_3)_3