Instructions and observations concerning the use of the chlorides of soda and lime / by A.G. Labarraque ; translated by Jacob Porter.

  • Labarraque, A. G. (Antoine Germain), 1777-1850.
Date:
1829
Catalogue details

Licence: Public Domain Mark

Credit: Instructions and observations concerning the use of the chlorides of soda and lime / by A.G. Labarraque ; translated by Jacob Porter. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    color, but this proves to be of no importance, for on decom- posing muriate of manganese by equal volumes of lime water and solution of chloride reduced to U more than 100 part of hvdrochlorate of manganese were necessary for the chloride of bine, while less than one part was sufficient for the lime water. The advantage which the solution of muriate of manganese offers as a chlorometric substance are threefold : 1. The uniform condition of the test. 2. The disengagement of the chlorine is produced by an acid which acts only while the metallic oxide with which it is combined is precipitated. 3. The precipitation of the oxide, which indicates the quantity of chlorine, precedes the disengagement of the gas, or at most is simultaneous with it; whereas in employing a solution of indigo the chlorine becomes at first free to react on the coloring matter, the destruction of which serves as the measure of its quantity. Hence the trial by muriate of man- ganese can be made slowly, and consequently more certain.