212. The EMF of a galvanic cell, composed of a hydrogen detection electrode and a calomel electrode filled with a saturated solution of potassium chloride, is 0.50 V at 25ºС. Determine the pH of the solution with which the hydrogen electrode is filled. Give a diagram of a hydrogen-calomel galvanic cell. How and why does the concentration of KCl affect the value of the electrode potential of the calomel electrode? The potential of a saturated calomel electrode is given in Table 3.

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