Conductometric and pH metric investigations of the oxalic acid and NaAsO2 reaction

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...

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Bibliographic Details
Published in:Journal of the Serbian Chemical Society Vol. 73; no. 11; pp. 1113 - 1122
Main Authors: MIRJANA V. OBRADOVIC, SLAVICA M. SUNARIC, SNEZANA S. MITIC, DRAGAN S. VESELINOVIC
Format: Journal Article
Language:English
Published: Serbian Chemical Society 01-01-2008
Subjects:
arsenic(III)
complex
conductometry
oxalic acid
pH-metry
Online Access:Get full text
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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 K0r = 5.05) and thermodynamic para¬meters 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).
ISSN:0352-5139
DOI:10.2298/JSC0811113O