Total number of moles of AgCl precipitated on addition of excess of AgNO3 to one mole each of the following complexes [Co(NH3)4Cl2]Cl, [Ni(H2O)6]Cl2,[Pt(NH3)2Cl2] and [Pd(NH3)4]Cl2 is
Correct Answer: 5
Approach Solution - 1
Gives 1 mole
Gives 2 moles
Gives No
Gives 2 moles
Total number of moles of mole.
Approach Solution -2
We need to analyze each complex and determine how many chloride ions are outside the coordination sphere (i.e., are ionizable). Only these chloride ions will react with AgNO$_3$ to form AgCl precipitate. \begin{enumerate}
[Co(NH$_3$)$_4$Cl$_2$]Cl: This complex has one chloride ion outside the coordination sphere. When AgNO$_3$ is added, it will react with this chloride ion: [Co(NH$_3$)$_4$Cl$_2$]Cl + AgNO$_3$ $\rightarrow$ [Co(NH$_3$)$_4$Cl$_2$]$^+$ + AgCl + NO$_3^-$ Thus, 1 mole of AgCl will be precipitated.
[Ni(H$_2$O)$_6$]Cl$_2$: This complex has two chloride ions outside the coordination sphere. When AgNO$_3$ is added, it will react with both chloride ions: [Ni(H$_2$O)$_6$]Cl$_2$ + 2AgNO$_3$ $\rightarrow$ [Ni(H$_2$O)$_6$]$^{2+}$ + 2AgCl + 2NO$_3^-$ Thus, 2 moles of AgCl will be precipitated.
[Pt(NH$_3$)$_2$Cl$_2$]: This complex has no chloride ions outside the coordination sphere. Therefore, it will not react with AgNO$_3$ and no AgCl will be precipitated.
[Pd(NH$_3$)$_4$]Cl$_2$: This complex has two chloride ions outside the coordination sphere. When AgNO$_3$ is added, it will react with both chloride ions: [Pd(NH$_3$)$_4$]Cl$_2$ + 2AgNO$_3$ $\rightarrow$ [Pd(NH$_3$)$_4$]$^{2+}$ + 2AgCl + 2NO$_3^-$ Thus, 2 moles of AgCl will be precipitated. \end{enumerate} Now, let's sum up the moles of AgCl precipitated: 1 mole (from [Co(NH$_3$)$_4$Cl$_2$]Cl) + 2 moles (from [Ni(H$_2$O)$_6$]Cl$_2$) + 0 moles (from [Pt(NH$_3$)$_2$Cl$_2$]) + 2 moles (from [Pd(NH$_3$)$_4$]Cl$_2$) = 5 moles Therefore, the total number of moles of AgCl precipitated is 5.
Final Answer: 5.00
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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.