The volume (in mL) of 0.1 $\mathrm{M}$ $\mathrm{AgNO}_{3}$ required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of $\left[\mathrm{Cr}\left(\mathrm{H}_{2}\mathrm{O}\right)_{5}\mathrm{Cl}\right]\mathrm{Cl}_{2}$, as silver chloride is close to

JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Coordination Compounds

The volume (in mL) of 0.1

M

AgNO_{3}

required for complete precipitation of chloride ions present in 30 mL of 0.01 M solution of

[Cr (H_{2} O)_{5} Cl] Cl_{2}

, as silver chloride is close to

Answer: 6

The complex

[Cr (H_{2} O)_{5} Cl] Cl_{2}

has 2 ionizable chloride ions (outside the coordination sphere) and 1 non-ionizable chloride (inside the coordination sphere).

Only the 2 ionizable

Cl^{-}

ions will precipitate with

Ag^{+}

.

Millimoles of ionizable

Cl^{-}

30 \times 0.01 \times 2 = 0.6

mmol

For complete precipitation:
Millimoles of

Ag^{+}

required = 0.6 mmol

0.1 \times V = 0.6

V = 6

JEE Advanced · 2011 · 10 Apr 2011 · Paper 2 · Integer answer