The chemical formula of aluminium carbonate is written as Al2(CO3)3.
The chemical formula of a compound is a representation of the atoms that compose the compound. Usually, the chemical formula is derived from the name of the compound.
We know that the carbonate ion is CO3^2- while the aluminium ion is Al^3+. It follows that the compound, aluminium carbonate ought to have the formula, Al2(CO3)3. The compound aluminum oxide has the formula Al2O3 while the compound aluminum bicarbonate has the formula Al(HCO3)3.
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