Excerpt from The Journal of the American Chemical Society, 1899, Vol. 21
In the investigations of Walker and Aston and also in those of Long the polariscope was used exclusively to follow the prog ress of the inversion. This is no doubt the simplest and most accurate method t... o use whenever it is applicable. It is evident, however, that the polariscope cannot be used in working with colored solutions and that the accuracy of measurement with this instrument is greatly impaired when the solutions are not perfectly clear. Long cites several instances where, after pro longed heating, the solutions became somewhat colored or turbid, making their polarization difficult.
The objects of this investigation are (1) to find a method by means of which the speed of inversion of sugar by colored salts can be determined, and (2) to compare the basicity of the met als as ascertained by the method of sugar inversion with their so-called solution tensions, as found by the measurement of the electromotive forces of galvanic chains.
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