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Electrochemistry

Question

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How would you determine the standard electrode potential of the system Mg²⁺/Mg?

Solution

Answer:

Use standard hydrogen electrode as anode and Mg²⁺ | Mg as a cathode we can measure the standard electrodepotential of systemMg²⁺ | Mg. Standard hydrogen electrode, represented by Pt(s), H₂(g) (1 atm) | H⁺ (aq) and dip the electrode of Magnesium wire in a 1M MgSO₄ solution .The standard hydrogen electrode is always zero.

Use formula

E^o_cell = E^o_right – E^o_left

The standard hydrogen electrode is always zero.

So that the value of

E^o_left=0

Hence

E^o_cell = E^o_Mg|Mg2+

Or

E^o_Mg|Mg2+= E^o_cell

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