This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1898 Excerpt: ... long time to expel carbon dioxide. The results
are presented in tables XXIII, XXIV, XXV, and XXVI. Those given in
Table XXIII were obtained by an assistant, in the laboratory, who
had had no previous experience with the method; titrations Nos. 1
and 2, made in beakers, being intended merely as rough
determinations to familiarize him with the method. The other
titrations were made in porcelain dishes. No titrations whatever
have been discarded, all being presented as they were obtained and
without preference. The methyl orange for all the titrations in
which its use is described in this paper was prepared by dissolving
1 gram in 200 cubic centimeters of water. A single drop only was
used for a titration. Even smaller quantities would have been
preferable. The Congo red was prepared by making a saturated
solution in 30 percent alcohol. The first column of the table gives
the number of the experiment; the second column, the number of
cubic centimeters of the sodium carbonate solution; the other
columns, the number of cubic centimeters of the hydrogen potassium
sulphate solution required, the indicator used being stated at the
head of the column: Table XXIII.--Titrations of Xa, CO, solution
unth N/'0 HKSO, for the purpose of comparing methyl orange and
Congo red as indicators. A series of titrations was then made to
determine at what point the titration should cease after the color
change began. It was clearly demonstrated that the best procedure
was to titrate until no further change of color could te
observed--in striking contrast to what was found advisable when
methyl orange was used. This point established, the titrations
presented in Table XXIV were made, the statement in brackets at the
right referring to the amounts of indicator used. The titrations
|Country of origin:
United States. Bureau of Soils
||246 x 189 x 18mm (L x W x T)
||Paperback - Trade
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