The object of the experiment was to compare the relative purity of several brands of table salt with crude sodium chloride as it comes from the mines. The comparison was made by a gravimetric determination of the chlorine as silver chloride. Two commercial samples obtained from the local stores were compared with a crude sample from Jefferson Island mine.
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Sullivan, Jean Horace
"A Comparison Of Commercial And Crude Samples Of Sodium Chloride,"
Field and Laboratory: Vol. 1
Available at: https://scholar.smu.edu/fieldandlab/vol1/iss2/7