The conductance of dilute aqueous sodium hydroxide solutions from 15° to 75°

Abstract

The conductances of sodium hydroxide solutions at 15', 2b0, 50°, and 75" have been determined at concentrations up to 0 . 0 2~ with special precautions to eliminate the effects of carbon dioxide and of alkaline attack on glass cells. The limiting conductances have been determined from the Fuoss-Onsager and Pitts equations, and the mobility of the hydroxide ion calculated. The theoretical specific conductance of water at various temperatures has been calculated.

The Fundamental Conductivity and Resistivity of Water

“…As evident in the last column of Table II, at temperatures below 60°C the experimental values of hydroxide conductivity deviated from the prior values by 0.7% or less. Above 60°C, the deviation of OH Ϫ increases rapidly with temperature, to 3% compared to the Marsh and Stokes value 10 and to over 4% at 100°C compared to the 1989 value. Table III incorporates the highest accuracy fundamental values, for ultrapure water, from 0°C to 100°C, for H ϩ, OH Ϫ, K w , d, H 2 O , and H 2 O .…”

“…7,8 Quist and Marshall et al gave elevated temperature data at 100 and 300°C for limiting ionic conductances. 8,9 A good determination for OH Ϫ is found in a 1964 paper by Marsh and Stokes, 10 and these values are summarized in the third column of Table II. This data was reported for temperatures of 15, 25, 50, and 75°C, and intermediate values may be estimated by interpolation.…”

Traceability of electrolytic conductivity measurements to the International System of Units in the sub mSm−1 region and review of models of electrolytic conductivity cells

“…The determination of the molar conductivities at infinite dilution is based on conductivity measurements of hydrochloric acid and sodium hydroxide above some tens of mS m −1 . The corresponding molar conductivities are fitted by semi-empirical functions and extrapolated to infinite dilution [24,[47][48][49][50] in order to deduce the limiting molar conductivities. However, the uncertainties of these "theoretical" values are difficult to estimate.…”

A new solvent system: Hydrothermal molten salt

“…Our operating conditions and equipment of the continuous conductivity probe are described in details in a previous work (10). Molar conductivity values of sodium hydroxide are taken from literature data (28). We carried out all analyses at an ambient temperature of 20°C.…”