Question:
Identify the formula of potassium trioxalato aluminate (III).
Identify the formula of potassium trioxalato aluminate (III).
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In coordination complexes, the metal ion is typically enclosed in square brackets, and the counterions (like K\(^+\)) are written outside.
Updated On: Jan 30, 2026
- K\(_4\)[Al(C\(_2\)O\(_4\))\(_3\)]
- K\(_3\)Al(C\(_2\)O\(_4\))\(_3\)
- Al\(_3\)[K\(_3\)(C\(_2\)O\(_4\))\(_3\)]
- K\(_3\)[Al(C\(_2\)O\(_4\))\(_3\)]
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the complex.
Potassium trioxalato aluminate (III) consists of potassium ions (K\(^+\)) and the complex ion [Al(C\(_2\)O\(_4\))\(_3\)]\(^{3-}\), where the aluminum ion is coordinated with three oxalate (C\(_2\)O\(_4\))\(^{2-}\) ligands. The formula is K\(_3\)[Al(C\(_2\)O\(_4\))\(_3\)].
Step 2: Analyzing the options.
(A) K\(_4\)[Al(C\(_2\)O\(_4\))\(_3\)]: Incorrect — The charge on the complex would not balance.
(B) K\(_3\)Al(C\(_2\)O\(_4\))\(_3\): Incorrect — The correct formula should have the complex ion in brackets.
(C) Al\(_3\)[K\(_3\)(C\(_2\)O\(_4\))\(_3\)]: Incorrect — This formula does not represent the correct stoichiometry of the ions.
(D) K\(_3\)[Al(C\(_2\)O\(_4\))\(_3\)]: Correct — This is the correct formula for potassium trioxalato aluminate (III).
Step 3: Conclusion.
The correct answer is (D) K\(_3\)[Al(C\(_2\)O\(_4\))\(_3\)].
Potassium trioxalato aluminate (III) consists of potassium ions (K\(^+\)) and the complex ion [Al(C\(_2\)O\(_4\))\(_3\)]\(^{3-}\), where the aluminum ion is coordinated with three oxalate (C\(_2\)O\(_4\))\(^{2-}\) ligands. The formula is K\(_3\)[Al(C\(_2\)O\(_4\))\(_3\)].
Step 2: Analyzing the options.
(A) K\(_4\)[Al(C\(_2\)O\(_4\))\(_3\)]: Incorrect — The charge on the complex would not balance.
(B) K\(_3\)Al(C\(_2\)O\(_4\))\(_3\): Incorrect — The correct formula should have the complex ion in brackets.
(C) Al\(_3\)[K\(_3\)(C\(_2\)O\(_4\))\(_3\)]: Incorrect — This formula does not represent the correct stoichiometry of the ions.
(D) K\(_3\)[Al(C\(_2\)O\(_4\))\(_3\)]: Correct — This is the correct formula for potassium trioxalato aluminate (III).
Step 3: Conclusion.
The correct answer is (D) K\(_3\)[Al(C\(_2\)O\(_4\))\(_3\)].
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