bleaching powder


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bleaching powder,

white or nearly white powder that is usually a mixture of calcium chloride hypochlorite, CaCl(OCl); calcium hypochlorite, Ca(OCl)2; and calcium chloride, CaCl2. Sometimes called chloride of lime, it can be prepared by reacting calcium hydroxide or slaked lime, Ca(OH)2, with chlorine gas, Cl2. It is used as a strong bleaching agent, as a disinfectant, and in making Javelle waterJavelle water
or Javel water
, Fr. eau de Javelle, aqueous solution of sodium or potassium hypochlorite. It was originally made near the French town of Javelle (now part of Paris) and was the first chemical bleach, a use first demonstrated by C. L.
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. Bleaching powder was first produced in 1799 by Charles Tennant in Glasgow, Scotland.

bleaching powder

[′blēch·iŋ ‚pau̇d·ər]
(materials)
A mixture of calcium hydroxide, calcium chloride, and calcium hypochlorite that is used as a bleaching agent. Also known as chloride of lime; chlorinated lime.

bleaching powder

a white powder with the odour of chlorine, consisting of chlorinated calcium hydroxide with an approximate formula CaCl(OCl).4H2O. It is used in solution as a bleaching agent and disinfectant
References in periodicals archive ?
The bleaching powder is dangerous for the health of public, as spots could be created on the body due to its reaction.
If you get a choking feeling or a smell of musty hay, You can bet your bottom dollar that there's phosgene on the way, But the smell of bleaching powder will inevitably mean, The enemy you're meeting is the gas we call chlorine.
Sodium hypochlorite - bleaching powder - in a hot 10% solution kills both the bacilli and the spores.