pH standardization of 0.05 mol center dot kg(-1) tetraoxalate buffer: Application of the Pitzer formalism

With the aim to surpass the concentration limit imposed by the Bates-Guggen heim convention, the Pitzer formalism has been applied to the analysis of t he standardization of the pH buffer, potassium tetraoxalate dihydrate. Foll owing the same procedure that has been conventionally applied to other pH b uffers,., hydrogen electrodes have been used to measure the potential diffe rences of Harned cells, which contained 0.05 mol.kg(-1) potassium tetraoxal ate and up to 1 mol.kg(-1) KCI, at 25 degreesC. A value of pH = 1.650 has b een calculated. Another simpler model for activity coefficients, the Guggen heim specific interaction theory, has been found to be inadequate to model this complex system.