Aluminium sulfate is widely used in municipal water treatment as a coagulant to assist in the removal of suspended impurities. It is prepared by reacting solid aluminium hydroxide with dilute sulfuric acid:
aluminium hydroxide+sulfuric acid→aluminium sulfate+water \text{aluminium hydroxide} + \text{sulfuric acid} \rightarrow \text{aluminium sulfate} + \text{water} aluminium hydroxide+sulfuric acid→aluminium sulfate+waterWhich of the following is the correct chemical formula for aluminium sulfate?
Al3(SO4)2\text{Al}_3(\text{SO}_4)_2Al3(SO4)2
Al2SO4\text{Al}_2\text{SO}_4Al2SO4
Al2(SO4)3\text{Al}_2(\text{SO}_4)_3Al2(SO4)3
Al(SO4)3\text{Al}(\text{SO}_4)_3Al(SO4)3
