126. Make a diagram of a galvanic cell consisting of zinc and iron plates immersed in solutions of their salts. Write the electronic equations for the processes occurring at the anode and at the cathode. What concentration had to be taken of iron ions (mol / l) so that the EMF of the element became equal to zero if [Zn2] \u003d 0.001 mol / l? Take f=1 for the ion activity coefficient.

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