Download PDF by T E. Thorpe: A Dictionary of Applied Chemistry

By T E. Thorpe

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C. by a few weeks' ; bleaching powder, even if packed in good casks. Good Powder. Properties of Bleaching bleaching powder is a pure white powder, often mixed with lumps which, however, ought to be transformed to the core, and which are often removed by riddling. It has a peculiar smell, quite different from that of chlorine, and not owing to hypochlorous acid, since it is just as perceptible in alkaline solutions, or on the skin after washing with soap, &c. It may possibly be due to the action of the compound upon matter.

Long before our present theories made it unlikely that CaO could combine as such with chlorine, Balard, in 1835, propounded is MgC0 3 ' his patent for absorbing chlorine by dry hydrate of lime, and the compound thus formed, * bleaching powder,' was sold by the St. Rollox Works, established in the same year, at 140?. per The average composition Buxton. ; ; j ' The floor is made of large stone flags, or of coal-tar asphalt, the joint between the sides and the edge of the floor being specially protected by a skirting and asphalt poured behind it.

About 10 to 12 cwts. of bleach. It has been found useless to attempt utilising the contact substance by redipping it in the copper solution or in any other way. The cost of copper for the chlorine. Deacon's process deals with the gaseous hydrochloric acid, as it is evolved in decomposing common salt by sulphuric acid without condensing it into liquid acid. This is evi- dently a great advantage in one way, but when the salt cake is made in the ordinary handworked pot and furnace, it has the drawback that in the beginning of each operation much more HC1, and hence more Cl, is got than afterwards.

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A Dictionary of Applied Chemistry by T E. Thorpe


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