Beryllium sulphate tetrahydrate

Beryllium sulphate (01m). Dissolve 17-7 g beryllium sulphate tetrahydrate, BeS04.4H20 in water and dilute to 1 litre. 

SYNS BERYLLIUM SULPHATE TETRAHYDRATE SULFURIC ACID, BERYLLIUM SALT (1 1), TETR. HYDRATE... 

The characteristic features of hydrate structures of this type may be best illustrated by describing in detail one typical such compound and by then considering only briefly a number of others which have been studied. The structure which we select for discussion is that of beryllium sulphate tetrahydrate. 

Beryllium Sulphate Tetrahydrate, BeS0. 4H20.— The tetrahydrate was first prepared by. Berzelius, (1815 i) who considered it to be an acid salt. Awdejew (1842 2) first determined its true character and used the salt to determine the atomic weight of beryllium. It was also employed for this purpose by Weeren (1854 i), Klatzo (1869 i)> Nilson and Pettersson (1880 6) and Kriiss and Moraht (1890 7). Parsons (1904 5) showed that the sulphate lost water continuously over phosphoric anhydride and discarded it as a means of determining the atomic weight of the element. This salt of beryllium has been studied more than any other compound of the metal. 

Properties.—Beryllium sulphate tetrahydrate consists of colorless octahedral crystals belonging to the tetragonal system. According to Topsoe (1872 i) and Topsde and Christiansen (1873 9) the crystals are unaxial and optically negative. Observed iorms (on).(no) a c=i 0.9461. Mean indices of refraction C= 1.4374 0 = 1.4691... 

Beryllium Sulphate Dihydrate, BeS04.2Hj0, is prepared by drying the tetrahydrate at 100 and is stable in dry air below this temperature. Nilson and Pettersson (1880 6), Krass and Moraht (1890 7), Parsons (1904 5, 1904 10), Levi-Malvano (1905 7). It dissolves readily in water passing back into the tetrahydrate. 

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