File:An introductory course of lessons and exercises in chemistry (rewritten 1919) (1919) (14784671685).jpg

Identifier: introductorycour00scho (find matches)
Title: An introductory course of lessons and exercises in chemistry (rewritten 1919)
Year: 1919 (1910s)
Authors: Schoch, Eugene Paul, 1871- (from old catalog)
Subjects: Chemistry
Publisher: (Austin) The Chemical laboratory of the University of Texas
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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2 inches in diameter. Dip their upper edges inmelted paraffin to a depth of one inch in order to close up the pores inthese parts of the cups. Secure two rubber stoppers large enough to fitthese cups. Perforate one with two holes so as to admit a small graphiterod, and a narrow piece of glass tubing; perforate the other two withholes so as to admit a stout lead wire, and also a piece of narrow glasstubing. Secure three glass jars or beakers, two of which are to be filledwith water and are to be used to collect gases—in burettes, over water—as shown in the accompanying sketch. The third is to be filled with asaturated solution of salt—sodium chloride—and into this are to beplaced the porous cups. Secure the rest of the apparatus and connectit as shown in the accompanying sketch. Note that the ends of the con-ducting tubes under the burettes are drawn out to fine openings, bent soas to be horizontal, and placed as high in the water as possible. 166 Schoch: Introductory Chemistry
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Chapter XI 167 Fill the negative pole cup—the one with the lead wire—about half fullof dilute sulphuric acid. Fill the other pole half full of a mixture pre-pared as follows: Dilute one part of concentrated hydrochloric acid withone part of water, and add a little chloride of lime:—enough chlorineshould be evolved by the action of this mixture to saturate the liquid. Connect up the whole apparatus, turn on a moderate current, and allowit to run for a few minutes until it appears that the gases collect in theburettes at equal rates. Then interrupt the electric current, refill theburettes with water, and turn on the electric current again. Note therates at which, the gases collect in the burettes. Repeat the measurement.How is the ratio of these volumes of hydrogen and chlorine, respectively,related to the ratio in which the gases combine by volume? Note, however, that in this electrolytic cell, the hydrogen isevolved from sulphuric acid, the chlorine from hydrochloric acid,and th

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