I found an interesting (and therefore in German) article at Gallica on the subject of hypochlorite decomposition, containing a large number ofĮxperiments. Just in case someone wanted to view Wouter's method. Rinse the crystals in the filter with ice-cold water. Filter to obtain the raw potassium chlorate. Crystals of potassium chlorate will form. Bring the solution to a boil and add water untill all potassium chlorate has dissolved.ĩ. A white precipitate of potassium chlorate should form.Ĩ. Mix this solution with the boiled calcium hypochlorite solution. The potassium chloride, and allow to cool again. If crystals form, add some more water, boil again to dissolve This can be doneīy dissolving the potassium chloride in about 200 ml of water, and allowing it to cool. In a separate container, dissolve 68 grams of potassium chloride in the smallest volume of water possible (approximately 195 ml). Allow the solution to cool down, and filter to remove the precipitated calcium chloride.Ħ. When all calcium hypochlorite has been added, continue boiling untill no more foaming is observed. ![]() If too much foam is developed, do not add any more calcium hypochlorite and boil untill the foam subsides. Stir vigorously during this step, occasionally scraping over the bottom to prevent the formation of a cake of calcium chloride. The calcium hypochlorite usually comes in tablets, which need to beĬrushed first. To the boiling water, add 125 gram of calcium hypochlorite in 10 gram portions. Place 250 ml of water in a heat resistant glass or stainless steel container, large enough to hold twice that volume.ģ. The procedure below has been optimised to reduce the chances of anġ. It seems to be very uncommon that explosions happen and they can probably be prevented by vigorous stirring, but I thoughtĮveryone attempting this method should know so proper precautions can be taken. I was also not sure wheter I was using calcium hypochlorite or trichlorohydrocyanuric acid, another common poolĬhlorinating agent. I am not sure exactly what caused the explosion. Warning: On one occasion an small explosion occured when I was doing this preparation. Procedure when using calcium hypochlorite ![]() There did not seem to be any odor of chlorine during theĢ0 g. The loss in weight (0.93 g.) corresponds to 100% purity.Ĭovering the solution during heating seems important, so that it doesn't react with CO2. ![]() of this was heated to full evolution of oxygen in an weighed test tube with aĬertain amount of ignited MnO2 (homemade CMD). Plates, isolated yield 45% of theoretical). of familiar uniform, dry, and free-flowing glittering This precipitate was, guess what, vacuum filtered, air dried with heat, and weighed (2.7 g. ![]() After 4 hours there was another vacuum filtration (precooled frittedįilter), and the precipitate was recrystallized by dissolving in 25 ml boiling tap water and cooling in the fridge. KCl (a likely ill-advised very large excess) was added with stirring, and the mixture was again vacuumįiltered and placed in the crucible, which was then placed in the freezer. glazed and covered porcelain crucible and heated in a water bath to 70C for 4 hours, a random time and random temperature. This mixture was vacuum filtered through fritted glass, leaving solids that weighed 5 g. warm tap water until everything that was going toĭissolve dissolved. of pool hypochlorite (label says: 52% Ca(OCl)2, 49% active chlorine) was stirred with 200 g. Not being at all pissed that a moderator said that heating solutions of calcium hypochlorite does not produce chlorate, two weeks after I said that it does, the following happened:Ģ0 g. you'd indeed first have to do the metathesis I think I mentioned this before somewhere, but Ca(OCl)2 is not disproportionable to Ca-chlorate.
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