Automatic titration by stepwise addition of equal volumes of titrant. Part V. Extension of the Gran I method for calculation of the equivalence volume in acid-base titrations
- 1 January 1980
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 105 (1253) , 802-810
- https://doi.org/10.1039/an9800500802
Abstract
A very simple method for numerical calculation of the equivalence volume (Ve) from titration data is presented. It is based on the method of stepwise addition of equal volumes of titrant combined with an extended version of the Gran I method. The expressions derived may be summarised in a general equation: [graphic omitted] where Vi and Vj are two additions of titrant (Vi is iVp, where Vp is the volume of each addition). The term aij is different for strong acids and weak acids and for conditional titrations, but in all instances only the ratio between hydrogen ion concentrations is required. E. g., for a weak acid [graphic omitted]. The titration method can also be used for the determination of the conditional normal potential E′o and the constant jH in the junction potential jH[H] for an electrode couple in a given medium.Keywords
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