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Write the cell reaction and calculate th...

Write the cell reaction and calculate the emf of the following cell at 298 K.
`Sn(s)|Sn^(2+)(0.004M)||H^(+)(0.02M)|H_(2)(g)"(1 bar)"|Pt(s).`
`(E_(Sn^(2+)|Sn)=-0.14V)`

Text Solution

Verified by Experts

Cell reaction,
`Sn(s)+2H^(+)(0.02M)rarrSn^(2+)(0.004M)+H_(2)(g)("1 bar")`
`E_("cell")^(@)=E_(H^(+)|(1)/(2)H_(2))^(@)-E_(Sn^(2+)|Sn)^(@)=0-(-0.14)=0.14V`
`E_("cell")=E_("cell")^(@)-(0.0591)/(n)log(([Sn^(+2)]xxp_(H_(2)))/([H^(+)]^(2)))`
`=0.14-(0.0591)/(2)log((0.004xx1)/([0.02]^(2)))=0.11V`
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