Bleaching powder CaCl

Calcium hypochlorite may be prepared by passing chlorine into a slurry of lime and sodium hydroxide. Alternatively, chlorine is passed into a solution of hydrated lime to produce bleaching powder, CaCl(0Cl) H20 ... 

Small amoimts of CI2 are made from dilute H2SO4 and bleaching powder, CaCl(ClO) -H20 etc., with the same result from HCIO and HCl ... 

Up to now it has not been finally decided which view mentioned above is correct regarding the reaction which takes place during the chlorination of lime. Industrially, bleaching powder is usually considered to bo a compound CaCl (0C1), without, however, attributing to this formula other than a merely qualitative meaning. 

The formula CaCl (CIO), which approximates the composition of commercial bleaching powder, indicates it to be a calcium chloride-hypo-... 

A solution of bleaching powder contains calcium hypochlorite [Ca(0Cl)2.4H20], calcium chloride [CaCl, Ca(OH),.Hp], lime hypochlorous acid formed by the... 

Chlorine reacts with many metals, often violently if the metal is finely divided, to form binary compounds such as iron (III) chloride, magnesium chloride, and so forth. Traces of water may accelerate the reaction. The product of the reaction of chlorine with calcium hydroxide is bleaching powder. Although sometimes shown as a mixed salt, CaCl(OCl), bleaching powder also has been represented as a mixture of Ca(OCl)2, CaCl2, and Ca(OH)2. 

Bleaching powder was formerly considered as a mixture of calcium chlorid and hypochlorite, formed by the reaction 2CaO-l-2Cla=CaCla-t-Ca(C10)a, but it is more probable that it is a definite compound having the formula CaCl(OCl), which is decomposed by HaO into a mixture of CaCla and Ca(C10)g and by dilute HNOs or HaSOa with formation of HCIO. 

Further chlorination converts basic hypochlorite to hypochlorite Ca(C10)j4H20. Bleaching Powder is thus considered a mixture of calcium hypochlorite arid basic calcium chloride i.e., Ca(Cl0)y4H20 and CaCl Ca(OH) fO. This is in good agreement with microscopic and X-ray analysis of the substance. This has been further confirmed by phase rule study. 

Chlorinated lime (chloride of lime) is widely used as bleaching powder. Its approximate composition is Ca(C10)2 CaClg or CaCl(ClO). Being a hypo-halogenite it reacts with an alkaline solution of T1(I) to yield brown TIO(OH) as stated on page 149. On the other hand, the ignition residue of chlorinated... 

Chlorine is converted into bleaching powder, a mixture of CaCl(C10) H20, Ca(0H)2 CaCl(C10) etc. in varying ratio, by Ca(OH)2. 

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