The volume (in mL) of 0.1 M AgNO 3 required for complete precipitation of chloride ions present in 20 mL of 0.01 M solution of [ Cr ( H 2 O ) 5 Cl ] Cl 2 as silver chloride is ________ . [2023]

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Solution

Q.
The volume (in mL) of 0.1 M ${AgNO}_{3}$ required for complete precipitation of chloride ions present in 20 mL of 0.01 M solution of $[Cr {(H_{2} O)}_{5} Cl] {Cl}_{2}$ as silver chloride is ________ . [2023]

Ans.
(4)

$[Cr {(H_{2} O)}_{5} Cl] {Cl}_{2} + 2 {AgNO}_{3} ⟶ [Cr {(H_{2} O)}_{5} Cl] {({NO}_{3})}_{2} + 2 AgCl ↓$

$0.01 M \times 20 mL$ $0.1 M \times V$ $= 0.2 millimole$

$0.2 millimole [Cr {(H_{2} O)}_{5} Cl] {Cl}_{2} requires 0.4 millimole {AgNO}_{3}$

$0.1 \times V = 0.4$

$V = \frac{0.4}{0.1} = 4 mL$

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