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Write the Nernst equation and calculate ...

Write the Nernst equation and calculate the e.m.f. of the following cell at 298K.
`Sn_((s))|Sn_((0.050M))^(2+)||H^(+)(0.020M)|H_(2)(1atm//Pt)`
Given `E_(Sn//Sn^(2+))^(@)=-0.14V`
`EMF=(E_(H^(+)//1//2H_(2))^(@)-E_(Sn^(2+)//Sn)^(@))-(0.0591V)/(2)"log"([Sn^(2+)])/([H^(+)]^(2))`.

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