Theory of Errors And Least Squares a Textbook for College Students And Research

Cover Theory of Errors And Least Squares a Textbook for College Students And Research
Theory of Errors And Least Squares a Textbook for College Students And Research
Le Roy D Le Roy Dougherty Weld
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Illustrations from Chemistry.
1. Volumetric Solutions. — It is desired to test certain acid and alkaline solutions to be used in volumetric chemical analysis, in order to ascertain their exact strengths. Two common reagents, in the form of tenth-normal solu- tions, may be tested first, then others may be compared to these. If the two reagents chosen be hydrochloric acid and potassium hydroxide, the following procedure may be employed.
A quantity of each solution is placed in an accurately gradu
...ated burette, the two burettes being supported side by side. A small amount (say about 0. 2 g. ) of finely pulverized pure calcium carbonate (chalk, CaCOs) is carefully weighed, placed in a white porcelain dish and treated with an excess (say about 50 cc. ) of the HCl solu- tion from the burette, the amount being accurately ob- served. The chalk dissolves and neutralizes part of the acid, the CO2 gas escaping. The porcelain dish is now set under the KOH burette, and just enough of the alka- line solution allowed to flow into it to render it exactly neutral, this point being determined by a drop or two of methyl orange or other sensitive indicator previously added to the mixture in the dish.

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