The Examination of Waters And Water Supplies

Cover The Examination of Waters And Water Supplies
The Examination of Waters And Water Supplies
John Clough Thresh
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The amount of soap destroyed by 1 mlgr. Of that salt is not exactly one-tenth of that destroyed by 10 mlgr. ; hence tables have been con- structed which pretend to show the amount of calcium carbon- ate equivalent to the soap solution used. What good purpose is served by such a table I have never been able to divine. The unit above suggested and generally adopted has a definite meaning and practical use. A water of 8 hardness will waste twice as much soap as one of 4, and only half as much as o...ne of 16, &c. Beyond this it means nothing definite, but it gives a rough idea of the amount of calcium and magnesium salts present, and this rough approximation is very often quite suffi- cient for the purpose of the analyst. If it is not, it is far more satisfactory to determine the amount of these salts by the methods proper for their estimation than to attempt to calculate it from the results of the soap test.
The hardness left after boiling may or may not be entirely due to sulphates and chlorides.


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