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

نویسندگان

  • MIRJANA V. OBRADOVIĆ
  • SLAVICA M. SUNARIĆ
  • SNEŽANA S. MITIĆ
  • DRAGAN S. VESELINOVIĆ
چکیده

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 0 r K = 5.05) and thermodynamic parameters were calculated using the data obtained by pH-metric measurements at 25.0±0.1 °C (∆H = 10.5 kJ mol-1, ∆G = –29.0 kJ mol-1, ∆S = 133 J mol-1 K-1).

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تاریخ انتشار 2008