Calculation of Stoichiometric Point Potential and Terminal Error in Redox Titration

1. Stoichiometric point potential: ESP = (n1e1o'+N2E2o')/(n1+N2) (for symmetrical pairs)

E1o' e2o' refers to the conditional potential of oxidant pair and reductant pair; N 1 and n2 refer to the number of electrons gained and lost by oxidant pair and reductant pair. If the conditional potential cannot be found, the standard electrode potential can be used instead.

2. For titration reaction: AOX 1+BRED 2 = A red 1+BOX2.

Terminal error is: te% = {{b * [ox1] sp-a * [red2] sp}/a * [ox2] sp} *100%.

[Ox 1]sp and [Red2]sp are calculated by nernst formula.

Generally, it is not common to find the terminal error of redox potential, but the potential change (titration breakthrough) before and after the metering point exceeds 0. 1%.

AE = e 1o '-E2o '-{ { 3 * 0.059 *(n 1+N2)}/(n 1 * N2)}

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