3. The EMF of a circuit composed of silver chloride Ag|AgCl|KCl and quinhydrone (c.g.e.) Pt|C6H4(OH)2,C6H4O2,H electrodes is 0.274 V at 298 K. Determine the pH of the test solution if Ех.g.e.=0.699 V and ЕAg|AgCl=0.226

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