A quinhydrone electrode can be used to measure the pH of a solution. (Quinhydrone, Q•QH2, is a complex of quinone, Q=C6H4O2, and hydroquinone, QH2=C6H4O2H2). The electrode half-reaction is written as Q 2H 2e → QH2, standard potential Eo = 0.6994 V. Calculate the pH of the HCl solution if the element
hg | Hg2Cl2 | HCl | Q•QH2 | Pt
has an EMF = 0.190 V.

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