(Image)
નીચે આપેલા ક્યા ગેલ્વેનિક કોષમાં થાય છે ?
Gas - gas \(1\)on electrode
\(\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{e}^{-}\)
Cathodic Reaction
Metal-metal insoluble salt anion electrode
\(\mathrm{Ag}_{(\mathrm{aq})}^{+}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}_{(\mathrm{s})}\)
\(\mathrm{AgCl}_{(\mathrm{s})} \rightleftharpoons \mathrm{Ag}_{(\mathrm{aq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}\)
\(\mathrm{AgCl}_{(5)}+\mathrm{e}^{-} \rightarrow \mathrm{Ag}_{(\mathrm{s})}+\mathrm{Cl}_{(\mathrm{aq})}^{-}\)
Overall redox reaction
\(\frac{1}{2} \mathrm{H}_{2(\mathrm{~g})}+\mathrm{AgCl}_{(\mathrm{s})} \rightarrow \mathrm{H}_{(\mathrm{sq})}^{+}+\mathrm{Cl}_{(\mathrm{aq})}^{-}+\mathrm{Ag}_{(\mathrm{s})}\)
Cell Representation
\(\mathrm{Pt}\left|\mathrm{H}_{2(\mathrm{~g})}\right| \mathrm{kCl}_{(\mathrm{sol})}\left|\mathrm{AgCl}_{(\mathrm{s})}\right| \mathrm{Ag}\)
$M|{M^ + }||{X^ - }|X,$ ${E^o}({M^ + }/M)$ $= 0.44\, V$ અને ${E^o}(X/{X^ - })$ $= 0.33\,V$ છે.આ આંકડા પરથી શું તારણ કાઢી શકાય?
$Pt _{( s )}\left| H _2( g , 1\,atm )\right| H ^{+}( aq , 1 M )|| Fe ^{3+}( aq ), Fe ^{2+}( aq ) \mid Pt ( s )$
$298\,K$ પર જયારે કોષ નો પોટેન્શિયલ $0.712\,V$ હોય તો $\left[ Fe ^{2+}\right] /\left[ Fe ^{3+}\right]$ નો ગુણોત્તર $.......$ છે.
આપેલ:$Fe ^{3+}+ e ^{-}= Fe ^{2+}, E ^{\circ} Fe ^{3+}, Fe ^{2+} \mid Pt =0.771$
$\frac{2.303 RT }{ F }=0.06\,V$
$Fe \rightarrow Fe^{2+} + 2e^{-} , E^{o} = 0.44\,\, V , 2H^{+} + 2e^{-} + \frac{1}{2} O_2 \rightarrow H_2O_{(l)}, E_{o} = 1.23\, V$ તો આ પ્રક્રિયા માટે $\Delta G^{o} =....$ કિલોજૂલ / મોલ
${Cu}({s})\left|{Cu}^{2+}({aq})(0.01 {M}) \| {Ag}^{+}({aq})(0.001 {M})\right| {Ag}({s})$ કોષ માટે ,કોષનો પોટેન્શિયલ $=.....\times 10^{-2} {~V}$
[ઉપયોગ : $\frac{2.303 {RT}}{{F}}=0.059$ ]