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Updated: June 15, 2025
Filter through blotting paper, and to the clear filtrate add some phosphate of soda solution. A second precipitation proves the presence of magnesia. Sulphates. A solution of barium chloride and dilute hydrochloric acid gives a white turbidity. Chlorides. A solution of silver nitrate and nitric acid gives a white curdy precipitate. Test for Lead in Drinking Water.
It is a white, crystallizable salt of a taste resembling that of niter, soluble in water and alcohol, and extremely poisonous. It dissolves the chlorides, iodides, and bromides of silver, is, therefore, a fixing agent, but has not come in general use as such. Water........100 c. cm.
The insoluble barium and radium sulphates, after being converted into chlorides or bromides, are separated by repeated fractional crystallization. One kilogram of impure radium bromide is obtained from a ton of pitchblende residue after processes continued for about three months during which time, five tons of chemicals and fifty tons of rinsing water are used.
It was while investigating the action of iron salts upon organic matter in solution and splitting up the chlorides present by means of electrolysis, that I first became aware of the importance of precipitating the soluble organic matter in such manner that no chemical solution should take the place of the precipitated organic matter.
Phosphate of lime and magnesia in food principally furnish the animal with the materials of which the bony skeleton of its body consists. Saline substances chlorides of sodium and potassium, sulphate and phosphate of potash and soda, and some other mineral matters occurring in food supply the blood, juice of flesh, and various animal juices, with the necessary mineral constituents.
Truth may also be compared in this respect to certain chemical stuffs which in themselves are gaseous, but which for official uses, as also for preservation or transmission, must be bound to a firm, palpable base, because they would otherwise volatilise. For example, chlorine is for all such purposes applied only in the form of chlorides.
For example, in the analysis of silicate rocks, the sodium and potassium present may be obtained in the form of their chlorides and weighed together. If the weight of such a mixture is known, and also the percentage of chlorine present, it is possible to calculate the amount of each chloride in the mixture.
Lloyd's discovery of the "death bacillus" of the sea toad, and his experiments on it with potassium cyanide, sent his name and that of his university ringing round the world; nor was Paul a whit behind when he succeeded in producing laboratory colloids exhibiting amoeba-like activities, and when he cast new light upon the processes of fertilization through his startling experiments with simple sodium chlorides and magnesium solutions on low forms of marine life.
The specific gravity of the St. Lawrence water above Montreal is about 1·00038, at the temperature of 66°, the air being then 82° of Fahrenheit. It contains the chlorides, sulphates, and carbonates, whose bases are lime and magnesia, particularly and largely those of lime, which accounts for the rapid depositions when the water is heated.
From a rough chemical analysis of the sample submitted to us, we find that it consists of gelatine, with small amounts of mineral ingredients. Josef Horadam, some few years ago, patented in Germany a process for preserving glues from decomposition, by the addition of from 8 to 10 per cent. of magnesium or calcium chlorides.
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