Chemistry Practice Problems Formation Constant Practice Problems Solution: Calculate the solubility of silver chloride in a s...

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Solution: Calculate the solubility of silver chloride in a solution that is 0.160 M in NH3 (initial concentration).

Problem

Calculate the solubility of silver chloride in a solution that is 0.160 M in NH3 (initial concentration).

Solution

We’re being asked to calculate the solubility of Silver Chloride (AgCl) in 0.160 M NH3. The presence of NH3 would increase the solubility of AgCl because Ag+ would be consumed to form Ag(NH3)2+(aq)


There are two reactions involved:


Reaction 1:

AgCl (s) ⇌  Ag+(aq)  +   Cl- (aq) 

Ksp = [Ag+][Cl-]  =  1.6x10-10   (you can get the Ksp value in books or the internet)


Reaction 2:

Ag+(aq)  +  2  NH(aq)  ⇌   Ag(NH3)2+ (aq)        A coefficient of 2 is added to NHto balance the reaction.

Kf=[AgNH32][Ag+][NH3]2=1.7×107  (you can get the Kvalue in books or the internet)


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