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Chemistry Question on Electrochemistry

Which cell will measure standard electrode potential of copper electrode?

A

Pt(s)∣H2(g,0.1 bar)∣H+(a,1 M)∣∣Cu2+(a,1 M)∣CusPt_{\left(s\right)}\left|H_{2}\left(g, 0.1\,bar\right)\right|H^{+}\left(a, 1\,M\right)\left||Cu^{2+}\left(a, 1\,M\right)\right|Cu_{s}

B

Pt(s)∣H2(g,1 bar)∣H+(a,1 M)∣∣Cu2+(a,2 M)∣CusPt_{\left(s\right)}\left|H_{2}\left(g, 1\,bar\right)\right|H^{+}\left(a, 1\,M\right)\left|\right|Cu^{2+}\left(a, 2\,M\right)|Cu_{s}

C

Pt(s)∣H2(g,1 bar)∣H+(a,1 M)∣∣Cu2+(a,1 M)∣CusPt_{\left(s\right)}\left|H_{2}\left(g, 1\,bar\right)\right|H^{+}\left(a, 1\,M\right)\left|\right|Cu^{2+}\left(a, 1\,M\right)|Cu_{s}

D

Pt(s)∣H2(g,1 bar)∣H+(a,0.1 M)∣∣Cu2+(a,1 M)∣CusPt_{\left(s\right)}\left|H_{2}\left(g, 1\,bar\right)\right|H^{+}\left(a, 0.1\,M\right)\left|\right|Cu^{2+}\left(a, 1\,M\right)|Cu_{s}

Answer

Pt(s)∣H2(g,1 bar)∣H+(a,1 M)∣∣Cu2+(a,1 M)∣CusPt_{\left(s\right)}\left|H_{2}\left(g, 1\,bar\right)\right|H^{+}\left(a, 1\,M\right)\left|\right|Cu^{2+}\left(a, 1\,M\right)|Cu_{s}

Explanation

Solution

To calculate the standard electrode potential of the given cell it is coupled with the standard hydrogen electrode in which pressure of hydrogen gas is one bar and the conc. of H+ ion in the solution is one molar and also the concentrations of the oxidised and the reduced forms of the species in the right hand half-cell are unity.