Question:
The molecular formula of a coordinate complex is CoH\(_{12}\)O\(_6\)Cl\(_3\). When one mole of this aqueous solution of complex is reacted with excess of aqueous AgNO\(_3\) solution, three moles of AgCl were formed. What is the correct formula of the complex?
The molecular formula of a coordinate complex is CoH\(_{12}\)O\(_6\)Cl\(_3\). When one mole of this aqueous solution of complex is reacted with excess of aqueous AgNO\(_3\) solution, three moles of AgCl were formed. What is the correct formula of the complex?
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When determining the formula of a complex, consider the stoichiometry of the reaction with other compounds (like AgNO\(_3\)) to identify the number of ligands and counterions.
Updated On: Aug 23, 2025
- [Co(H\(_2\)O)\(_6\)]Cl\(_3\)
- [Co(H\(_2\)O)\(_6\)]Cl\(_2\)H\(_2\)O
- [Co(H\(_2\)O)\(_6\)]Cl\(_3\)(H\(_2\)O)
- [Co(H\(_2\)O)\(_6\)]Cl\(_3\)(H\(_2\)O)
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The Correct Option is A
Solution and Explanation
When one mole of the given complex reacts with excess AgNO\(_3\) solution, three moles of AgCl are formed. This suggests that the complex contains three chloride ions. The correct formula of the complex is [Co(H\(_2\)O)\(_6\)]Cl\(_3\), where Co is coordinated to six water molecules, with three chloride ions as counterions.
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