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Updated: June 18, 2025
Analyses made at the Bureau of Government Laboratories, Manila, show that the clays used in the Samoki pots contain the following mineral: Analyses of Samoki pottery clays Minerals. Brown pit clay Blue surface clay Per cent PER CENT Silica 54.46 60.99 Oxide of aluminum 16.77 17.71 Ferric oxide of iron 11.14 9.53 Oxide of calcium 0.53 0.59 Loss by ignition 16.81 10.65
Tests. Can be extracted from an alkaline solution of chloroform. The residue left on the evaporation of chloroform should be employed for testing. If heated with strong nitric acid and allowed to cool, a purple colour is produced. Ferric chloride gives a blood-red coloration, destroyed by the addition of mineral acids. Treatment.
The active agent may be considered to be !nascent! hydrogen, and it must be borne in mind that the visible bubbles are produced by molecular hydrogen, which is without appreciable effect upon ferric iron. The rate at which the iron solution passes through the zinc should not exceed that prescribed, but the rate may be increased somewhat when the wash-water is added.
Preference is here given to iron crucibles, because the resulting ferric hydroxide is more readily brought into solution than the nickelic oxide from a nickel crucible. The subsequent boiling insures the complete decomposition of the peroxide.
Heated with bromine water to 120°C. it decomposes into bromoform, carbon dioxide, nitrogen, and pyridine. Turning now to the non-volatile and oxygenized bases, we take up first the opium alkaloids. Morphine, C H NO , is a tertiary amine, and appears to contain a hydroxyl group like phenols, to which class of bodies it has some analogies, as is shown in its reaction with ferric chloride.
Aniline is a weak base and forms salts with the mineral acids. Aniline hydrochloride forms large colourless tables, which become greenish on exposure; it is the "aniline salt" of commerce. The sulphate forms beautiful white plates. Although aniline is but feebly basic, it precipitates zinc, aluminium and ferric salts, and on warming expels ammonia from its salts.
It is, in general, true that oxidizable substances are determined by !direct! titration, while oxidizing substances are determined by !indirect! titration. The important oxidizing agents employed in volumetric solutions are potassium bichromate, potassium permangenate, potassium ferricyanide, iodine, ferric chloride, and sodium hypochlorite.
To be more explicit, science is the knowledge we possess of nature and her laws; or, more properly speaking, God and His laws. When we say that oxygen and iron unite and form ferric oxide, we express a law of matter: that is, that these elements have an affinity for each other. A collection of similar facts and their systematic arrangement, we call chemistry.
During evaporation a mutual decomposition of the two acids takes place, and the nitric acid is finally decomposed and expelled by the excess of hydrochloric acid. Iron is usually found in the precipitate of barium sulphate when thrown down from hot solutions in the presence of ferric salts.
If mixtures of ferric oxide and manganese peroxide with plaster of Paris are employed, the electromotive force is slightly higher than with plaster of Paris alone; and when ferric oxide is used, the battery quickly regains its original strength on breaking the circuit. When the battery is exhausted, the solid plaster of Paris has simply to be moistened again with the solution.
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