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
- The chemical formula of the compound formed between aluminium and sulphate ions is Al2(SO4)3, where aluminium (Al) has a charge of +3 and the sulphate ion (SO4) has a charge of -2.
- The formula is derived by balancing the charges of aluminium and sulphate ions. Two aluminium ions (+6 total charge) combine with three sulphate ions (-6 total charge) to maintain electrical neutrality.
- This compound is commonly known as aluminium sulphate, used in water purification, paper manufacturing, and as a mordant in dyeing fabrics.
- Aluminium sulphate is a salt that dissolves in water to release aluminium and sulphate ions.
- The molecular weight of Al2(SO4)3 is approximately 342.15 g/mol.
Additional Information
- Aluminium Ion (Al3+):
- Aluminium is a metal in group 13 of the periodic table and forms a trivalent ion (Al3+) by losing three electrons.
- It is lightweight, corrosion-resistant, and widely used in industries.
- Sulphate Ion (SO42-):
- The sulphate ion is a polyatomic anion consisting of one sulfur atom covalently bonded to four oxygen atoms in a tetrahedral arrangement.
- It carries a charge of -2 and is commonly found in various compounds like gypsum (CaSO4·2H2O).
- Balancing Chemical Formulas:
- In ionic compounds, the total positive charge must equal the total negative charge to ensure electrical neutrality.
- For Al3+ and SO42-, the charges are balanced by taking two aluminium ions and three sulphate ions.
- Applications of Aluminium Sulphate:
- Used in water treatment plants as a coagulating agent to remove impurities.
- Employed in the paper and textile industries as a sizing agent and mordant.
- Serves as a key component in antiperspirants and deodorants.
- Ionic Bonding in Al2(SO4)3:
- The compound is held together by ionic bonds formed between Al3+ cations and SO42- anions.
- These bonds give aluminium sulphate its crystalline structure and solubility in water.
Last updated on Jun 6, 2025
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