The action of water on lead : being an inquiry into the cause and mode of the action and its prevention / by John Henry Garrett.

  • Garrett, John Henry.
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: The action of water on lead : being an inquiry into the cause and mode of the action and its prevention / by John Henry Garrett. Source: Wellcome Collection.

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    of action or development of obstruction to tbe action. It is quite a common thing for a water which acts on lead to lose its power of action when it is boiled in a flask, but it is not invariable, as shown in the next experiment. Experiment IV.—A distilled water, which acted very strongly on lead in the way described under Experiment I., was boiled 10 minutes, then cooled and placed in the jar, lead being added. The reaction of the water was on the alkaline side of neutrality. Action began quickly, and after one hour was marked. After 12 hours a considerable amount of lead compound had been deposited on the bottom of the vessel and about the pieces of lead. It was of a curdy appearance. After 48 hours much action had taken place; the product during latter part of time had been of the usual scaly crystalline appearance. It is important to notice that the first portion of white lead compound produced had not the usual scaly appearance, but formed a more curd-like precipitate. This experiment negatives the idea that when the action of a water is prevented by boiling the water, the destruction or dissipation of the cause of action is the true reason. On the other hand, the idea that the water contains a new substance after boiling in a glass flask which prevents the action being exercised receives accentuation. It