Coordination CompoundHard

Question

Co-ordination number of Cr in CrCl3.5H2O is six. The maximum volume of 0.1 N AgNO3 needed to precipitate  the chlorine in outer sphere in 200 ml of 0.01 M solution of the complex is/are:

Options

A.140 ml
B.40 ml
C.80 ml
D.20 ml

Solution

(B) [Cr(H2O)5Cl]Cl2 + 2AgNO3 →  2AgCl + [Cr(H2O)5Cl] (NO3)2
      number of mole of complex = 200 × 0.01 = 2
      required milli mole of AgNO3 = 4
      milli mole = M × Vml      ⇒    4 = 0.1 × Vml = 40 ml
(D) [Cr(H2O)5Cl2]Cl + AgNO3 →  AgCl + [Cr(H2O)5Cl2] (NO3)
      number of mole of complex = 200 × 0.01 = 2
      required milli mole of AgNO3 = 2
      milli mole = M × Vml    ⇒   2 = 0.1 × Vml = 20 ml.

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