If for a cyclic voltammogram the \(E^{\mathrm{O} \prime}\) for quinone, \(Q\), appears at a \(+0.220 \mathrm{~V}\) at a platinum electrode (versus silver/silver chloride ref. electrode) at \(\mathrm{pH} 7.0\), what direction would \(E^{\circ \prime}\) shift at \(\mathrm{pH}6.0\) ?

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+ 2e + 2H+