Question:
A solution containing $2.675\, g$ of $CoCl_3. 6\, NH_3$ (molar mass $= 267.5\, g\, mol^{-1}$) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of $AgNO_3$ to give $4.78\, g$ of $AgCl$ (molar mass $= 143.5 \,g \,mol^{-1}$). The formula of the complex is (At. Mass of Ag = 108 u)
A solution containing $2.675\, g$ of $CoCl_3. 6\, NH_3$ (molar mass $= 267.5\, g\, mol^{-1}$) is passed through a cation exchanger. The chloride ions obtained in solution were treated with excess of $AgNO_3$ to give $4.78\, g$ of $AgCl$ (molar mass $= 143.5 \,g \,mol^{-1}$). The formula of the complex is (At. Mass of Ag = 108 u)
Updated On: Jul 2, 2022
- $[Co(NH_3)_6]Cl_3$
- $[CoCl_2(NH_3)_4]Cl$
- $[CoCl_3(NH_3)_3]$
- $[CoCl(NH_3)_5]Cl_2$
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The Correct Option is A
Solution and Explanation
$ {CoCl3. 6NH3 ->[AgNO_3] x AgCl ?}$
$n(AgCl) = x\, n(CoCl_3. 6NH_3)$
$\frac{4.78}{143.5} = x \frac{2.675}{267.5}\quad\therefore x = 3$
$\therefore$ The complex is $\left[Co\left(NH_{3}\right)_{6}\right]Cl_{3}$
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.