. Transactions of the American Philosophical Society. ollowing process is a modification of Winklers method forthe determination of dissolved oxygen in water {Zeitschr. Ang. Chem., 1891, p. 105). Two bottles of about two ounces capacity are connected as shown in the gas stream enters by A and bubbles through soda solution and manganouschloride consecutively. After complete expulsion of air by the gas current, the 208 RESEARCHES UPON THE CHEMICAL PROPERTIES OP GASES. tube B is pushed down so that some of the soda solution is forced over into themanganous chloride solution, causing a
. Transactions of the American Philosophical Society. ollowing process is a modification of Winklers method forthe determination of dissolved oxygen in water {Zeitschr. Ang. Chem., 1891, p. 105). Two bottles of about two ounces capacity are connected as shown in the gas stream enters by A and bubbles through soda solution and manganouschloride consecutively. After complete expulsion of air by the gas current, the 208 RESEARCHES UPON THE CHEMICAL PROPERTIES OP GASES. tube B is pushed down so that some of the soda solution is forced over into themanganous chloride solution, causing a precipitation of manganous hydroxide. Thisprecipitate remains white in the absence of oxygen. If oxygen be present, it grad-ually darkens in changing to On adding now a little iodide of potassiumsolution and then sulphuric acid, by the tap funnel, the oxide of manganese redis-solves, liberating iodine, recognizable by its color even when the most minute tracesonly of oxygen are present. The same apparatus can be used for pyrogallol andsoda. U. NaOH Solution =^
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