Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Basicity of Dimethyl Sulfoxide in an Aqueous Solution as Measured by the Spectrophotometric Indicator Method
Goro Wada
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1969 Volume 42 Issue 4 Pages 890-893


The basic nature of dimethyl sulfoxide (DMSO) has been known in water, and so has its pKa value, which varies somewhat according to the measuring methods. In the present work, a spectrophotometric method employing thymol blue and o-nitroaniline as indicators was applied; the thermodynamical pKa° value of DMSO was determined to be −1.04 at 25°C. Since there is no dependence of pKa° upon the temperature, the proton transfer from water to DMSO in water is likely to be athermal.

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