A problem in ionic equilbrium

  • #1
vijayramakrishnan
90
0

Homework Statement



please see the attached image

1998 ,b part question
[/B]


Homework Equations



none

The Attempt at a Solution



i thought that Agcl would give Ag+ and cl- ions whose concentration can be found from Ksp as √Ksp,this Ag+ reacts with NH3 to give Ag(NH3)2+ (reverse of the given reaction) since Kc of the reaction is given we can find concentration of Ag(NH3)2+ from it which is Kc= [Ag(NH3)2+]/[Ag+][NH3]2

but answer obtained is not matching, is the method correct ?,please help.
 

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Answers and Replies

  • #2
Borek
Mentor
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It is not clear to me whether 1M ammonia is the final concentration, or added concentration (in which case some of the ammonia would be consumed).

Your approach is OK in the first case, can be wrong in the latter.
 
  • #3
vijayramakrishnan
90
0
It is not clear to me whether 1M ammonia is the final concentration, or added concentration (in which case some of the ammonia would be consumed).

Your approach is OK in the first case, can be wrong in the latter.
sir it is the initial concentration i suppose
 
  • #4
Borek
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Then you need to take the reaction stoichiometry into account (simplest approach: an ICE table).
 
  • #5
vijayramakrishnan
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Then you need to take the reaction stoichiometry into account (simplest approach: an ICE table).
oh i think i made a mistake concentration of ammonia in initial state is 1 M not the equilbrium concentration,sir are the rest of steps correct?
 
  • #6
Borek
Mentor
29,003
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As I told you:

Your approach is OK in the first case, can be wrong in the latter.
 

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