Potentiometric measurements of the buffer TES have been made in the temperature range of 5 to 37°C. The Harned cell of the type: Pt, H2 (g, 1 atm)│TES (m1) + NaTESate (m2) + NaCl (m3)│AgCl, Ag was used. The values of the Second Dissociation constant, pK2 of the buffer TES have been determined at the experimental temperatures 5, 15, 25, and 37°C. The values of pK2 at 25 and 37°C are 7.550 and 7.336 respectively. These values lie in the physiological pH range and would be interpreted in terms of their application in biomedical and pharmaceutical studies. The thermodynamic functions (ΔG0, ΔS0, ΔH0, and ΔCp0) have been calculated in all experimental temperatures.

Second step dissociation constant (pK2), and related thermodynamic quantities of TES buffer from 5 to 37°C

253rd National Meeting (2017)

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