In the proceedings of the "Iowa Academy of Science," XVII, 131, we described a series of experiments to show the effect of long grinding on water of crystallization. Some of the results were rather surprising, and we decided to repeat the work, and also to include a larger number of hydrates in the experiments. The conditions under which the work was done were as uniform as possible. After grinding, the specimens were kept from the air in ground glass stoppered bottles of about 20 c.c. capacity. Gram portions were weighed out for all determinations. In finding the water content of the unground specimens, the coarse crystals were merely crushed, and the fine crystals were used without further division. Usually about three grams were taken for the grinding, which was effected in a large highly polished agate mortar. 'The grinding was continued for two hours. In some cases it might be hard to decide whether the loss of water is due to efflorescence or to the heat caused by the continual grinding. Both causes doubtless contributed to some of the results.
Proceedings of the Iowa Academy of Science
© Copyright 1912 by the Iowa Academy of Science, Inc.
"The Effect of Continued Grinding on Water of Crystallization (Second Paper),"
Proceedings of the Iowa Academy of Science, 19(1), 133-136.
Available at: https://scholarworks.uni.edu/pias/vol19/iss1/22