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The quinhydrone electrode (Q,H^(o+)|H^(2...

The quinhydrone electrode `(Q,H^(o+)|H^(2)Q)` is used in conjunction with a saturated calomel electrode, as represented below`:`

`EMF_(cell)=0.264V` at `30^(@)C`. Calculate the `pH` of unknown solution at this temperature.
Given `:E_(calomel)=0.24V` and `E^(c-)._(2H^(o+),Q|H_(2)Q)=0.7V`

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