Aluminium sulfate is widely used in municipal water treatment as a coagulant to clump and remove suspended impurities. It is composed of aluminium ions, Al3+\text{Al}^{3+}Al3+, and sulfate ions, SO42−\text{SO}_4^{2-}SO42−.
What is the chemical formula for aluminium sulfate?
Al3(SO4)2\text{Al}_3(\text{SO}_4)_2Al3(SO4)2
Al2(SO4)3\text{Al}_2(\text{SO}_4)_3Al2(SO4)3
Al2SO4\text{Al}_2\text{SO}_4Al2SO4
Al3SO4\text{Al}_3\text{SO}_4Al3SO4
74 exam-style questions on OCR GCSE Chemistry Bonding. Each one has a worked solution and a mark scheme showing where the marks go.