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30 May, 12:42

What is the standard emf of a galvanic cell made of a cd electrode in a 1.0 m cd (no3) 2 solution and a cr electrode in a 1.0 m cr (no3) 3 solution at 25°c?

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  1. 30 May, 15:11
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    Standard reduction potential of Cd2 + = - 0.403 v

    Standard reduction potential of Cr3 + = - 0.74 v

    Here, reduction potential of Cd2 + is higher as compared to Cr3+. Hence, it will preferentially undergo reduction.

    The electrochemical cell is represented as

    Cr/Cr3 + / / Cd2+/Cd

    Now, standard EMF of cell = E = ECd2+/Cd - ECr3+/Cr

    = - 0.403. - (-0.74)

    = 0.337 v
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