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The ferrocene/ferricinium pair (Fc+/Fc)was taken as the redox indicator and the quinone/hydroquinone pair(Q/H2Q) as the pH indicator. R0(H) was determined using simple potentiometric measurements, taking the system (Fc+/Fc)as the comparison. R0(H) acidity is related to measurements of potential by the following equation [3]:R0(H) =( E H2O (Q/H2Q) − E H2O−acid (Q/H2Q))/0.058
where E H2O (Q/H2Q) represents the potential of the system (Q/H2Q) measured in water and E H2O−acid (Q/H2Q) represents the potential of the system (Q/H2Q) measured in the phosphoric acid solution. These potentials are expressed in relation to the system Fc+/Fc.
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