Methods In Chemical Analysis, Originated Or Developed In The Kent Chemical Laboratory Of Yale University - Couverture souple

Gooch, Frank Austin

 
9780548805664: Methods In Chemical Analysis, Originated Or Developed In The Kent Chemical Laboratory Of Yale University

Synopsis

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Présentation de l'éditeur

The tubes A and Bare so selected that very little of the product evolved can escape between them, and, in case they fit very loosely, a ring of paraffin melted into the mouth of A, about B, by means of a hot wire, seals the joint securely. A very convenient way to attach the paraffin is to melt it between A and another tube, which fits A, as does B, and may be removed by a turning motion, leaving the ring into which Bwill fit. Very little heating is then required to make a tight joint. If care be used in taking apart A and B, at the close of an experiment, such a ring of paraffin remains in place and may be used many times without replacement, being remelted by a touch of the hot wire before every new experiment. In making a determination, the substance under examination is weighed and placed in the bottom of A. The reagent to be employed, 10 cm.3 to 15 cm.3, is drawn into C, and held there in the manner described. The test tube A is slipped over B, and the joint is sealed with paraffin, as has been shown. The apparatus is wiped, placed on the balance and weighed. Upon removing the cap from the small tube in C, the reagent runs from Cinto A. The volatile product, forced upward through the drying column of calcium chloride, escapes through the annular space between Band C. When action ceases, a current of dry air is forced through C, to remove all the volatile product, the cap is replaced, and the apparatus is weighed. The loss of weight represents the volatile product. Hydrogen by Loss.
(Typographical errors above are due to OCR software and don't occur in the book.)

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