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Those in most common use are iron wire, ferrous ammonium sulphate, sodium oxalate, oxalic acid, and some other derivatives of oxalic acid. With the exception of sodium oxalate, these all contain water of crystallization which may be lost on standing. They should, therefore, be freshly prepared, and with great care.
This percentage is determined by an indirect method, in which the manganese dioxide is reduced and dissolved by an excess of ferrous sulphate or oxalic acid in the presence of sulphuric acid, and the unused excess determined by titration with standard permanganate solution. The reaction involved is
The most important combinations among the foregoing are: Potassium bichromate and ferrous salts; potassium permanganate and ferrous salts; potassium permanganate and oxalic acid, or its derivatives; iodine and sodium thiosulphate; hypochlorites and arsenious acid.
In 1780 he discovered lactic acid, and showed that it was the substance that caused the acidity of sour milk; and in the same year he discovered mucic acid. Next followed the discovery of tungstic acid, and in 1783 he added to his list of useful discoveries that of glycerine. Then in rapid succession came his announcements of the new vegetable products citric, malic, oxalic, and gallic acids.
This may be of reflex character, as seen in the shock produced by the pain caused by corrosive poisons, or the poison may exert a special action on certain structures, as belladonna on the cells of the brain, strychnine on the motor nerve cells of the spinal cord. In Both Ways. Certain poisons, as carbolic or oxalic acids, act in this way.
And there must be a piece of cheesecloth with which to wipe possible dust from the line, a scrubbing brush for the cleaning-up process which closes the washing drama, and the various preparations used to remove stains and assist in the cleansing of the linen and clothing borax, starch, bluing, ammonia, oxalic acid, soda, kerosene, turpentine, etc.
Oxalic, citric, tartaric, succinic, malic, gallic and tannic are other well-known organic acids. Some of these are contained in the sap or juice of certain plants, and these or others are formed when crop residues are decomposed in the soil. In the ultimate decomposition of organic matter the carbon appears in the form of carbon dioxid which when combined with water forms carbonic acid.
"The necessary particulars will be sent to your solicitors, and I hope you will then get busy. "Ta-ta, old crock. Yours, Mabel. "P.S. You shouldn't leave oxalic acid about like that. Don't you know it's a poison? I've hidden it underneath your dress-shirts, in case of accidents." Luke put the letter down. There was a step outside the door and Dot entered.
Another brake is supplied by the waste products of metabolism in the system, the uric acid, carbonic acid, oxalic acid, etc., and the many forms of xanthines, alkaloids, and ptomaines.
Abundance of beverage, moreover, presents other advantages, in that it facilitates digestion by reason of its diluent action, a fact well worth bearing in mind when treating the obese who are possessed of gouty diathesis, and whose kidneys are accordingly encumbered with uric and oxalic acids.
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