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The standard reduction potentials of two...

The standard reduction potentials of two half cells `Al^(3+) (aq) | Al`and `Mg^(2+)(aq) | Mg` are -1.66V and -2.36V respectively. Calculate the standard cell potential. Write the cell reactions also.

Text Solution

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Since, `Mg^(2+) (aq) | Mg` electrode= - 2.36 V is at a lower potential than `Al^(3+)(aq) |Al` electrode = - 1.66 V therefore, `Mg^(2+) (aq) | Mg` electrode acts as the anode and `Al^(3+)(aq) |Al`acts as the cathode. In other words, Mg loses electrons and `Al^(3+)` ion accepts electrons. Thus, the cell reaction is
`3 Mg + 2Al^(3+) rarr 3Mg^(2+) + 2Al` and `E_(cell)^(0) = E_(Al^(3+)|Al)^(0) - E_(Mg^(2+)|Mg)^(0)` = -1.66 –(-2.36) = +0.70
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Knowledge Check

  • The standard reduction potentials of Cu^(2+)|Cu and Cu^(2+)|Cu^(o+) are 0.337V and 0.153V , respectively. The standard electrode potential fo Cu^(o+)|Cu half cell is

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