The quinhydrone electrode was introduced in 1921 as a means of measuring pH.20 The
Chapter 13, Problem 13-36(choose chapter or problem)
The quinhydrone electrode was introduced in 1921 as a means of measuring pH.20 The solution whose pH is to be measured is placed in the left halfcell, which also contains a 1:1 mole ratio of quinone and hydroquinone. The half-cell reaction is (a) Write half-reactions and Nernst equations for each half-cell. (b) Ignoring activities, rearrange the Nernst equation for the net reaction to the form E(cell) A ( ), where A and B are constants. Calculate A and B at 25 C. (c) If the pH were 4.50, in which direction would electrons flow through the potentiometer?
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