Question
Download Solution PDFWhich of the following correctly represents the chemical formula of a compound formed by aluminium and sulphate ions?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Al2(SO4)3.
Key Points
- Aluminium has a valency of +3 and forms the ion Al3+.
- Sulphate has a valency of -2 and forms the ion SO42-.
- To form a neutral compound, the charges must balance. Therefore, two Al3+ ions (total charge +6) will balance three SO42- ions (total charge -6).
- Thus, the correct formula for the compound formed by aluminium and sulphate ions is Al2(SO4)3.
- This compound is commonly known as aluminium sulphate, which is used in water purification, paper manufacturing, and as a mordant in dyeing and printing textiles.
Additional Information
- Al(SO4)3
- This formula incorrectly suggests that one aluminium ion can combine with three sulphate ions, which does not balance the charges correctly.
- Al2SO4
- This formula incorrectly represents the compound by not indicating the correct ratio of aluminium to sulphate ions.
- Al3(SO4)2
- This formula incorrectly represents the compound by suggesting a different ratio that does not balance the charges of the ions correctly.
Last updated on Jun 7, 2025
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