IS well known that the gravimetric determination of sulfur as barium sulfate is subject to rather large errors, due chiefly to coprecipitation. Many methods for the precipitation, Etration, and drying of the barium sulfate have been recommended. The author of each method generally gives experimental data on the determination of sulfur in a pure compound, such as sodium or potassium sulfate, to indicate the accuracy of the method. Frequently data are also included for the analysis of a mixture of the alkali sulfate with about an equal quantity of some other salt, such as sodium chloride or mírate. But data for the determina-cEoride. The method of Njegovan and Marjanovic ( ) was also tested and discarded because difficulty was experienced in filtering the very fine-grained precipitate.
A simple problem is described on the back of this sheet. I have been trying to solve it for more than a year as I have time to think about it, but my poor stubborn pea brain will not give. This irritates me so much that I am willing to pay for a solution.
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