Chemistry, asked by abhi261, 1 year ago

define electrode potential of a cell

Answers

Answered by Aman1911
1
Electrode potential is defined as the potential of a cell consisting of the electrode in question acting as a cathode and the standard hydrogen electrode acting as an anode. Reduction always takes place at the cathode, and oxidation at the anode. According to the IUPAC convention, the term electrode potential is reserved exclusively to describe half-reactions written as reductions. The sign of the half-cell in question determines the sign of an electrode potential when it is coupled to a standard hydrogen electrode.

Electrode potential is defined by measuring the potential relative to a standard hydrogen half cell

H2(g) →← 2H+(aq) + 2e-

The convention is to designate the cell so that the oxidised form is written first. For example

Pt(s)|H2(g)|H+(aq) Zn2+(aq)|Zn(s)

The e.m.f. of this cell is

e.m.f. = Eright - Eleft

By convention, at p(H2) = 101325 Pa and a(H+) = 1.00, the potential of the standard hydrogen electrode is 0.000 V at all temperatures. As a consequence of this definition, any potential developed in a galvanic cell consisting of a standard hydrogen electrode and some other electrode is attributed entirely to the other electrode

e.m.f. = E(Zn2+/Zn)

Hope it will help u
Answered by Shikhavns700
1

Potential diferente develop bw electrode & electrolytic solution is called electrode potential.

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