Measurement of effective HCl diffusion coefficients through aqueous and gel films by a pH jump technique
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 87 (2) , 293-296
- https://doi.org/10.1039/ft9918700293
Abstract
Direct measurement of HCl diffusion coefficients in low ionic strength media have not been reported owing to the practical difficulty of controlling pH gradients in two compartments of a diffusion chamber with minimal or no inclusion of buffer. Here we report a single-compartment system in which effective HCl diffusion to a membrane-mounted glass pH electrode can be measured under conditions approaching neutrality. A strong pH-dependent response of the membrane- or gel-mounted pH electrode was observed. Comparison of effective DHCl values in the presence of a mounted gel and/or membrane showed a clear decrease to that of a liquid film over the pH range studied (3.5–9.5). However, the study also demonstrated effective DHCl values to be strongly pH dependent with a minimum around neutrality.Keywords
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