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To transform the scale of redox titration for a unified formula of the titration scale, a relative concentration of the aqueous electron Re is proposed, and a new theory for redox titration is then developed with pRe as its monitoring scale. This new theory addresses the balancing of the semi-redox-reaction, provides the general formula for calculating pRe, investigates the general variation of pRe in titration, and reintroduces the principle of an electron indicator. In this study, the titration of Ce4+ to Fe3+ solution is used as an example to deduce the following aspects: the approach for drawing titration curves, calculation for titration jump ranges, and criterion of direct and accurate titrations. Finally, the effect of Kτ ϴʹ, which is the conditional equilibrium constant of a redox reaction, on titrimetric analysis is discussed. [ABSTRACT FROM AUTHOR]