Explanation
In Daniel cell, copper and zinc electrodes are immersed in a solution of copper (11) sulphate zinc sulphate respectively.
The cell is represented as
Zn(s) | Zn2+(aq) || Cu2+ (aq) | Cu (s)
(anode) (cathode)
Metals having more standard electrode potential will deposit rapidly.
Given, Ag+/Ag = +0.80V
Cu2+/Cu = +0.34V
Hg22+/Hg = +0.79 and Mg2+/Mg = -2.37V
Hence the order is Ag>Hg>Cu.
In an electrochemical series, the more negative E° value more is the position of equilibrium lies to the left, and more readily the metal loses electrons. Hence the more negative the E° value, the metal is stronger reducing agent.
Hydrogen’s standard electrode potential (Eo) is zero at all temperature . Potentials of any other electrodes are compared with that of standard hydrogen electrode at the same temperature .
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