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According to this method a stock solution of hypochlorite of lime was added to the water, the amount necessary for any given water being determined by a solution of potassium iodide and starch. This was particularly useful in the trenches where it was possible to accurately sterilize a pail or a barrel of water if necessary.
Small tablets of hypochlorite of lime, each one sufficient to sterilize a pail of water, were also ordered and issued to the first Canadian division, and proved useful.
He dropped a few drops of the hypochlorite solution on to the tile, and immediately the black stain faded away and vanishod. "We can now answer your question, Mr. Barton," said he, replacing the stopper as he turned to our client. "The specimen that you brought us certainly contains arsenic, and in very considerable quantities." "Then," exclaimed Mr.
In some processes the electrolysis affords directly an alkaline hypochlorite or a chlorate, the former being of wide commercial use as a bleaching agent in textile works and in the paper industry. The same process employed in the electrolysis of sodium salts is used in the case of magnesium and calcium.
It is, in general, true that oxidizable substances are determined by !direct! titration, while oxidizing substances are determined by !indirect! titration. The important oxidizing agents employed in volumetric solutions are potassium bichromate, potassium permangenate, potassium ferricyanide, iodine, ferric chloride, and sodium hypochlorite.
Polton advanced to the table, on which he deposited a small flask, the contents of which were in a state of brisk effervescence, a bottle labelled "calcium hypochlorite," and a white porcelain tile. The flask was fitted with a safety-funnel and a glass tube drawn out to a fine jet, to which Polton cautiously applied a lighted match. Instantly there sprang from the jet a tiny, pale violet flame.
It is more effectual to follow the bath of oxalic acid by applying a solution of one part hydrochloric acid to six parts of water, after which bathe in cold water, and dry slowly. Or an infusion of hypochlorite of potash in twice its volume of water may be used instead of the preceding. This operation may be repeated, if not effectual at the first trial.
Its use as a bleaching or disinfecting agent, or as a source of chlorine, depends upon the amount of hypochlorous acid which it yields when treated with a stronger acid. It is customary to express the value of bleaching powder in terms of "available chlorine," by which is meant the chlorine present as hypochlorite, but not the chlorine present as chloride.
When touched by a drop of the solution the paper turns blue until the hypochlorite has all been reduced and an excess of the arsenite has been added. Bleaching powder consists mainly of a calcium compound which is a derivative of both hydrochloric and hypochlorous acids. Its formula is CaClOCl.
At the positive pole, hypochlorite of iron seems to be formed at first, but this is quickly changed into a protochloride, and as at the negative pole an alkaline reaction takes place, the iron salt is precipitated in the form of the ferrous hydrated oxide, together with the organic matters in suspension and solution.
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