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Experiments upon magnesia alba, Quicklime, and some other Alcaline Substances

By Joseph Black

2018-10-20 00:18:38

The caution given of boiling the mixture is not unnecessary; if it be neglected, the whole of the magnesia is not accurately separated at once; and by allowing it to rest for some time, that powder concretes into minute grains, which, when viewed wit ... Read more
The caution given of boiling the mixture is not unnecessary; if it be neglected, the whole of the magnesia is not accurately separated at once; and by allowing it to rest for some time, that powder concretes into minute grains, which, when viewed with the microscope, appear to be assemblages of needles diverging from a point. This happens more especially when the solutions of the epsom-salt and of the alkali are diluted with too much water before they are mixed together. Thus, if a dram of epsom-salt and of salt of tartar be dissolved each in four ounces of water, and be mixed, and then allowed to rest three or four days, the whole of the magnesia will be formed into these grains. Or if we filtrate the mixture soon after it is made, and heat the clear liquor which passes thro'; it will become turbid, and deposite a magnesia. Less

Book Details

File size52.332 KB
Print pages50
PublisherPublic Domain Book
Publication date2015-08-21
LanguageEnglish
ISBN1296410803
Joseph Black was a Scottish physician and chemist, known for his discoveries of magnesium, latent heat, specific heat, and carbon dioxide....

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