Conductometric and pH metric investigations of the oxalic acid and NaAsO2 reaction
نویسندگان
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).
منابع مشابه
Kinetic Monte Carlo Simulation of Oxalic Acid Ozonationover Lanthanum-based Perovskitesas Catalysts
Kinetic Monte Carlo simulation was applied to investigation of kinetics and mechanism of oxalic acid degradation by direct and heterogeneous catalytic ozonation. La-containing perovskites including LaFeO3, LaNiO3, LaCoO3 and LaMnO3 was studied as catalyst for oxalic acid ozonation. The reaction kinetic mechanisms of each abovementioned catalytic systems has been achieved. The rate constants val...
متن کاملOxalic acid dihydrate catalyzed synthesis of 3,4-dihydropyrimidin-2-(1H)-one derivatives under thermal and solvent-free conditions
Oxalic acid dihydrate as a green, mild and efficient catalyst for the one-pot three-component Biginelli synthesis of 3,4-dihydropyrimidin-2-(1H)-one derivatives from the reaction between β-keto esters (methyl or ethyl acetoacetate), aromatic aldehyde (benzaldehye derivatives) and urea or thiourea under thermal and solvent-free conditions with excellent yields and short reaction time is st...
متن کاملOxalic acid dihydrate catalyzed synthesis of 3,4-dihydropyrimidin-2-(1H)-one derivatives under thermal and solvent-free conditions
Oxalic acid dihydrate as a green, mild and efficient catalyst for the one-pot three-component Biginelli synthesis of 3,4-dihydropyrimidin-2-(1H)-one derivatives from the reaction between β-keto esters (methyl or ethyl acetoacetate), aromatic aldehyde (benzaldehye derivatives) and urea or thiourea under thermal and solvent-free conditions with excellent yields and short reaction time is st...
متن کاملEffect of postharvest oxalic acid treatment on ethylene production, quality parameters, and antioxidant potential of peach fruit during cold storage.
The effects of postharvest oxalic acid (OA) treatment on ethylene production, fruit quality, bioactive compounds and antioxidant activity of peach fruit, were examined. Fruits were treated with oxalic acid immediately after harvest and stored at 1° C and 90% relative humidity for 28 days. The oxalic acid treated peach fruit exhibited significantly lower levels of ethylene production, pH, total ...
متن کاملMichael addition of Pyrrole and indole to α,β- unsaturated compounds in the Presence of oxalic acid
A Simple and efficient method for Michael addition of pyrrole and indole to α,β- un saturated compounds has been developed in the presence of oxalic acid under refluxing reaction condition was achieved.
متن کامل