Standard pH0 values for 0.05 mol kg-1 potassium phthalate reference buffer solutions in 10, 20, 50, 64 and 84.2 wt % methanol/water solvent mixtures have been obtained from cells without transport, in the temperature range 283.15-313.15 K. The consistency of results has been analysed by a new method of multilinear regression of the quantity p(aHγCl) as a function of both temperature and solution composition. The pH° values found can be reproduced within ± 0.01 by the equation pH0 = 4.00 + 4.38x - 5.02x2 + 4.23x3 + 0.13z - 0.91xz, where x = mole fraction of methanol in the solvent mixture, z = (T - θ)/θ and θ = 298.15 K. Subsidiary values of the first ionization constant of o-phthalic acid in the above solvent mixtures have also been obtained by the buffered cell method.

Determination of Standard pH Values for Potassium Hydrogenphthalate Reference Buffer Solutions in 10, 20, 50 64 and 84.2 wt per cent Methanol/Water Mixed Sovents at Temperatures from 283.15 to 313.15 K / T. Mussini, A. K. Covington, F. Dal Pozzo, P. Longhi, S. Rondinini, Z.-Y. Zou. - In: ELECTROCHIMICA ACTA. - ISSN 0013-4686. - 28:11(1983), pp. 1593-1598. [10.1016/0013-4686(83)85222-0]

Determination of Standard pH Values for Potassium Hydrogenphthalate Reference Buffer Solutions in 10, 20, 50 64 and 84.2 wt per cent Methanol/Water Mixed Sovents at Temperatures from 283.15 to 313.15 K

T. Mussini
Primo
;
P. Longhi;S. Rondinini
Penultimo
;
1983

Abstract

Standard pH0 values for 0.05 mol kg-1 potassium phthalate reference buffer solutions in 10, 20, 50, 64 and 84.2 wt % methanol/water solvent mixtures have been obtained from cells without transport, in the temperature range 283.15-313.15 K. The consistency of results has been analysed by a new method of multilinear regression of the quantity p(aHγCl) as a function of both temperature and solution composition. The pH° values found can be reproduced within ± 0.01 by the equation pH0 = 4.00 + 4.38x - 5.02x2 + 4.23x3 + 0.13z - 0.91xz, where x = mole fraction of methanol in the solvent mixture, z = (T - θ)/θ and θ = 298.15 K. Subsidiary values of the first ionization constant of o-phthalic acid in the above solvent mixtures have also been obtained by the buffered cell method.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/197449
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