Chemical Reagents Their Purity And Tests a New And Improved Text Based On And

E Emanuel Merck

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LIME, CHLORINATED White cubes with chlorine-like odor, and liberating chlorine on the addition of hydrochloric acid. 100 parts treated with hydrochloric acid should afford at least 25 parts of Cl. Specially prepared in cube form for the generation of chlorine in the laboratory.
TEST OF PURITY The value of this preparation depends entirely upon its active chlorine.
Quantitative Determination of Active Chlorine. Mix 0. 5 CHEMICAL REAGENTS 131 gm. Of the powdered cubes with a solution of 3 gm. Of ...potas- sium iodide in 60 cc. Of water, and add 5 cc. Of hydrochloric acid. Titrate the liberated iodine with decinormal sodium thiosulphate solution, of which at least 35. 2 cc. Should be required.
1 cc. Of decinormal Na 2 S 2 3 = 0. 003545 gm. Of Cl, log. 54962.
LIME WATER (SOLUTION OF CALCIUM HYDROXIDE) A clear, colorless liquid having a strongly alkaline reaction.
TEST OF STRENGTH Titrate 100 cc. Of lime water with normal hydrochloric acid, using methyl orange as the indicator. Not less than 4 cc.

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