bleaching powder


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

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 It was originally made near the French town of Javelle (now part of Paris) and was the first chemical bleach, a use first demonstrated by C. L.
..... Click the link for more information.
. 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