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Electrochemistry
Question
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What is meant by ‘standard electrode potential’ on the hydrogen scale?

Answer

A half-cell called standard hydrogen electrode
represented by Pt(s)l H2(g)lH+(aq), is assigned
a zero potential at all temperatures corresponding to the reaction;

H+ (aq) + e- ---->1/2H2(g)

The standard hydrogen electrode consists of a platinum electrode coated with platinum black. The electrode is dipped in an acidic solution and pure hydrogen gas is bubbled through it.

The concentration of both the reduced and oxidised forms of hydrogen is maintained at unity . This implies that the pressure of hydrogen gas is one bar
and the concentration of hydrogen ion in the
solution is one molar.

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