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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##
