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# 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##