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Authors

Nicholas Knight

Document Type

Research

Abstract

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.

Publication Date

1912

Journal Title

Proceedings of the Iowa Academy of Science

Volume

19

Issue

1

First Page

133

Last Page

136

Copyright

© Copyright 1912 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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