The In-In2S3 System 1441 out that the determination of kt is not very accurate and that the precision on the value of log kr is probably of the order of ±0.01. Furthermore, the same value of Dawas used in the calculations of kr at different ionic strengths, whereas Daactually decreases with increasing ionic strength.Measurements at ionic strengths lower than 0.01 were not carried out because it would have been necessary to decrease the concentrations of the buffer mixtures and pyruvic acid to values at which the accuracy of the polarographic measurements becomes too low.Conclusion.-The agreement between the values of the rate constant for ionic recombination, as obtained by the polarographic method and from Onsager's theory, is fair.Acknowledgment.-This investigation is part of the project NR 051-258 carried out at Louisiana State University under contract with the Office of Naval Research.
The specific volume of water has been measured at temperatures extending down to approximately −40°C by holding the water in fine capillaries, the smallest of which had a diameter of 4 microns.
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