What is the correct chemical formula for aluminium sulfate?
Answer and explanation
Correct answer: C. Al2(SO4)3
- Step 1: Aluminium forms the Al3+ cation. Sulfate is the polyatomic anion SO4(2-). Step 2. To balance charges: 2 (+3) + 3 (-2) = +6 - 6 = 0. The formula is Al2(SO4)3. Answer: Al2(SO4)3. Why not the others: Parentheses are mandatory around polyatomic ions when multiple units are present.
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