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Topic: bleaching powder-CaOCl2 or Ca(OCl)2 ?  (Read 35196 times)

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Offline AG

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bleaching powder-CaOCl2 or Ca(OCl)2 ?
« on: May 16, 2011, 09:11:26 AM »
whether bleaching powder is CaOCl2 or Ca(OCl)2 ?
If it is considered as a mixed salt of HCl and HOCl, Cl-Ca-OCl (ie, CaOCl2) will be right.
If it is salt of HOCl alone, it could be Ca(OCl)2. which is the correct one?

Offline ajkoer

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Re: bleaching powder-CaOCl2 or Ca(OCl)2 ?
« Reply #1 on: May 17, 2011, 11:40:32 AM »
Good question.

I read that the composition of Bleaching Powder was actually a dispute going on for decades.

One opinion, confirmed by experimental measurements of available Chlorine, was that the best formula was CaCl(OCl), a chloro-hypochlorite mixed salt. However, subsequent studies using X-ray diffractions found no evident supporting this structure.

What was found a mixture of Ca(OCl)2 and several hydrates of CaCl2.xH2O and Ca(OH)2. These structures support the problematic observation that the Bleaching Powder does not have an affinity for water like dry CaCl2, as the bound CaCl2 is apparently already in hydrated form!

Offline AG

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Re: bleaching powder-CaOCl2 or Ca(OCl)2 ?
« Reply #2 on: May 18, 2011, 04:41:26 AM »
the mixture of Ca(OCl)2 and hydrates of CaCl2.xH2O and Ca(OH)2 itself may support that bleaching powder is Ca(OCl)2, according to the eqn.
2Ca(OH)2+2Cl2  :rarrow: CaCl2+Ca(OCl)2+2H2O
thank you for the response ajkoer..

Offline Hunter2

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Re: bleaching powder-CaOCl2 or Ca(OCl)2 ?
« Reply #3 on: June 21, 2011, 02:31:46 AM »
Normal Formation is CaO + Cl2 => CaCl(OCl)

But 2 CaCl(OCl) => CaCl2 + Ca(OCl)2

So it is a mixture of all.

In aquaeous solution wie anyway only Ca2+, Cl- and OCl-

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