1.

Calculate the stability constant of the complex [Zn(NH_(3))_(4)]^(2+) formed in the reaction Zn^(2+)+4NH_(4)hArr[Zn(NH_(3))_(4)]^(2+). Given that E_(Zn^(2+)//Zn)^(@)=-0.76V and E_((Zn(NH_(3))_(4)]^(2+))^(@)//Zn,4NH_(3))^(@)=-1.03V

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Solution :We are given `ZN^(2+)(aq)+2e^(-)hArrZn(s)""E^(@)=-0.76V`
`[Zn(NH_(3))_(4)]^(2+)+2e^(-)hArrZn(s)+4NH_(3),E^(@)=-1.03V`
To GET the OVERAL reaction, we should write
`Zn^(2+)(aq)+2e^(-)hArrZn(s),""E^(@)=-0.76V`
`Zn(s)+4NH_(3)hArr[Zn(NH_(3))_(4)]^(2+)+2e^(-),""E^(@)=1.03V`
Adding, we get `E_(CELL)^(@)=1.03-0.76=0.27V`
`E_(cell)^(@)=(0.0591)/(n)logK` or `logKk=(0.27xx2)/(0.0591)=9.1371`
or `K="Antilog "9.1371=1.371xx10^(9).`


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