1.

what must be the concentration of aqueous of NH_(3) which must be added to a solution containing 4xx10^(-3)M Ag^(+) and 0.001M NaCl to prevent the precipitaion of AgCl.

Answer»

Solution :Silver ion concentration which can be ALLOWED to remain in the solutions
`1.8xx10^(-10)=[AG^(+)][CI^(-)]`
`[Ag^(+)]=(1.8xx10^(-10))/(0.01)=1.8xx10^(-7)M`
This quantity is so small that almost all the `Ag^(+)` ion will be consumed by `NH(3)` in COMPLEX formation.
`{:(,Ag^(+)+,2NH_(3)hArr,[Ag(NH_(3))_(2),]^(+),K=(10^(8))/(6)),(t=0,4xx10^(-3),b,0,),(at eq,1.8xx10^(-7),(b-8xx10^(-3)),4xx10^(-3),):}`


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