Conductometric and pH metric investigations of the oxalic acid and NaAsO2 reaction
The reaction between NaAsO2 and oxalic acid was studied by pH-metric and conductometric measurements, applying the methods of continual variation and pH-metric and conductometric titration. It was found that oxalic acid forms a complex anion of the type [AsOC2O4]-. The relative stability constant of...
Main Authors: | , , , |
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Format: | Article |
Language: | English |
Published: |
Serbian Chemical Society
2008-01-01
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Series: | Journal of the Serbian Chemical Society |
Subjects: | |
Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2008/0352-51390811113O.pdf |
Summary: | The reaction between NaAsO2 and oxalic acid was studied by pH-metric and conductometric measurements, applying the methods of continual variation and pH-metric and conductometric titration. It was found that oxalic acid forms a complex anion of the type [AsOC2O4]-. The relative stability constant of the complex at ionic strengths, I, of 0.10 (log Kr = 4.70), 0.20 (log Kr=4.51), 0.50 (log Kr = 4.24) and 0 (log K 0 = 5.05) and thermodynamic parameters were calculated using the data obtained by pH-metric measurements at 25.0±0.1°C (DH = 10.5 kJ mol-1, DG = -29.0 kJ mol-1, DS = 133 J mol-1 K-1). |
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ISSN: | 0352-5139 1820-7421 |