Preparation of Ammine Complexes of Cobalt(III) Give at least two differences bet

Question

Preparation of Ammine Complexes of Cobalt(III)

Give at least two differences between the two preparations that are carried out in this lab.

Part A Pentammine chlorocobalt(III) chloride-

[Co(H2O)6]2+ +5NH3 = [Co(NH3)5(H2O)]2+ + 5H2O

2[Co(NH3)5(H2O)]2+ + H2O2 --> 2[Co(NH3)5(OH)]2+ +2H2O

[Co(NH3)5(OH)]2+ +3Cl- --> [Co(NH3)5Cl]Cl2(s) + 2OH-

Part B Hexammine cobalt(III) chloride-

[Co(H2O)6]2+ + 6NH3 --> [Co(NH3)6]2+ + 6H2O

2[Co(NH3)6]2+ + 2H2O2 --> 2[Co(NH3)6]3+ + 2OH-

[Co(NH3)6]3+ +3Cl- --> [Co(NH3)6]Cl3(s)

Explanation / Answer

In part A :- 5 moles of ammonia is used whereas in partB 6 moles of ammonia is used.

In part A pentavalent ammonium complex is formed as intermediate complex whereas in part B hexavalent ammonium complex is formed as intermediate complex.

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