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Updated: May 1, 2025
To them we now look back wistfully, and wish that they might have been, if not as numerous as the Churchmen and Beformers, at least a sufficient body to have made their influence an effective force, with the advantage of more light and more patience that was really theirs. But, alas! they only counted as the first dissolvent which set free more corrosive and detrimental acids.
If the colour is not changed by this exposure in twelve or fourteen days, it may be considered as genuine; but if it is, the contrary is allowed. This proof, however, is not adapted to every colour; because some of them resist it, and yet will fade in consequence of the application of certain acids; others, on the contrary, that can not resist the natural proof remain unchanged by the latter.
The acids react on the cambium, which flows into the fruit, and, aided by the increased temperature, convert it into saccharine matter; at the same time they disappear, being saturated with gelatine, when maturation is complete. London Medical and Surgical Journal. We may here observe that in a recent paper, by Mr.
Their outer surface is often white, the original black flint having been discoloured and bleached by exposure to the air, or by the action of acids, as they lay in the gravel. They are most commonly stained of the same ochreous colour as the flints of the gravel in which they are imbedded.
If either the acid or the alkaline elements are present in excessive or insufficient quanitities, abnormal conditions and functions, that is, disease will be the result. All acids, with the exception of carbonic acid, exert a tensing influence upon the tissues of the body, while alkalies have a relaxing effect.
Some of these, notably the hydroxide, combine with acids and contribute to the total alkaline strength, but it is customary to calculate this strength in terms of sodium carbonate; i.e., as though no other alkali were present. PROCEDURE. In order to secure a sample which shall represent the average value of the ash, it is well to take at least 5 grams.
This is the sign of the proper saturation of the acids. To distinguish still better, turn the mixing bottle upside down, by closing its mouth with the thumb, and examine the color of the fluid in the tube-shaped neck of the bottle, and afterwards, should it be required, add another drop of the ammonia. Repeat this until the proper tone of color has been reached, neither red nor blue.
But we must observe that with these dibasic acids it is possible, by adding insufficient alkali to completely saturate them, to obtain salts in which only one hydrogen atom of the acid is replaced by the metal of the base. Thus sulphuric and carbonic acids yield NaHSO , acid sulphate or bisulphate of soda, and NaHCO , bicarbonate of soda, respectively.
He is the first to describe nitric acid and aqua regia. Before him no stronger acid was known than concentrated vinegar. We cannot conceive of chemistry as not possessing acids. Roger Bacon speaks of him as the magister magistrorum.
Electrolysis acts by decomposing the blood and tissues into their constituent elements oxygen and acids appearing at the positive, hydrogen and bases at the negative electrode. These substances and gases being given off in a nascent condition, at once enter into new combinations with anything in the vicinity with which they have a chemical affinity.
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