209. A galvanic cell consists of a silver electrode immersed in a solution of silver nitrate, the molality of which is 0.1 mol / kg, and the average ionic activity coefficient is 0.734, and a lead electrode immersed in a solution of lead nitrate. The emf of this element at 250C is 0.906 V. Calculate the potential of the silver and lead electrodes and the activity of lead ions in a solution of Pb(NO3)2. Write a diagram of a galvanic cell. Standard electrode potentials are given in table. 3.

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