Ammonia is a good complexing agent. Explain. - Chemistry

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Ammonia is a good complexing agent. Explain.

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Solution

  1. The lone pair of electrons on the nitrogen atom facilitates the complexation of ammonia with transition metal ions. Thus, ammonia is a good complexing agent as it forms a complex by donating its lone pair of electrons.
    a. \[\ce{\underset{(Blue)}{Cu^2+_{ (aq)}} + 4NH_{3(aq)}->\underset{(Deep blue)}{[Cu(NH3)4]^2+_{( aq)}}}\]
    b. \[\ce{\underset{(White)}{AgCl_{(s)}} + 2NH_{3(aq)}->\underset{(Colourless)}{[Ag(NH3)2]Cl_{( aq)}}}\]
  2. This reaction is used for the detection of metal ions such as Cu2+ and Ag+.
Concept: Chemistry of Notable Compounds of Elements of Groups 13, 14 and 15
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Chapter 9: Elements of Group 13, 14 and 15 - Exercises [Page 134]

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Balbharati Chemistry 11th Standard Maharashtra State Board
Chapter 9 Elements of Group 13, 14 and 15
Exercises | Q 14. | Page 134

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