Conductometric and pH metric investigations of the oxalic acid and NaAsO2 reaction
| Autor: | Snezana S. Mitic, Mirjana V. Obradović, Slavica Sunarić, Dragan S. Veselinović |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Journal of the Serbian Chemical Society, Vol 73, Iss 11, Pp 1113-1122 (2008) |
| ISSN: | 1820-7421 0352-5139 |
| Popis: | The reaction between NaAsO 2 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 [AsOC 2 O 4 ] - . The relative stability constant of the complex at ionic strengths, I, of 0.10 (log K r = 4.70), 0.20 (log K r = = 4.51), 0.50 (log K r = 4.24) and 0 (log K o r = 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, AG = -29.0 kJ mol -1 , ∇S = 133 J mol -1 K -1 ). |
| Databáze: | OpenAIRE |
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