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Write down the appropriate Nernst equati...

Write down the appropriate Nernst equation for the following voltaic cell and calculate the e.m.f. of the cell at 298 K. `Fe(s)|Fe^(2+)(0.002M)||Ag^(+)(0.02M)|Ag(s)`
`["Given, "E_(Fe^(2+)|Fe)^(@)=-0.44V and E_(Ag^(+)|Ag)^(@)=+0.80V" at 298K"]`

Text Solution

Verified by Experts


The Nernst equation for the cell reaction is
`E_("cell")=E_("cell")^(@)-(0.059)/(2)log.([Fe^(2+)])/([Ag^(+)]^(2+))("at "25^(@)C)`
and `E_("cell")=E_("cathode")^(@)-E_("anode")^(@)=0.80V-(-0.44V)=1.24V`
`therefore" "E_("cell")=1.24-(0.059)/(2)log.(0.02)/((0.02)^(2))=1.219V`
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