| 单词 | tungstic acid |
| 例句 | By weighing the sample first and extracting the tungsten we get the percentage, when it’s been filtered and dried and weighed again, of the tungstic acid in the ore. Shadow Mountain Alloys containing tungsten leave tungstic acid after treatment with nitric acid or aqua regia. A Text-book of Assaying: For the Use of Those Connected with Mines. Coolidge succeeded in accomplishing the feat in 1912 by reducing the tungstic acid by hydrogen and molding the metallic powder into a bar by pressure. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries An additional amount of the acid renders it violet, and a still larger quantity affords a beautiful pure blue color, similar to that produced by tungstic acid. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations Next followed the discovery of tungstic acid, and in 1783 he added to his list of useful discoveries that of glycerine. A History of Science — Volume 4 “Now,” he said, when the tungstic acid had been dissolved, and he had dropped a small bar of tin into the solution. Shadow Mountain This solution gives with hydrochloric acid a white precipitate of tungstic acid, which becomes yellow on boiling, but the separation is not complete. A Text-book of Assaying: For the Use of Those Connected with Mines. The tungstic acid is dissolved, and separated as ammonic tungstate, and, after evaporation, is gently ignited, the heat being increased towards the end. A Text-book of Assaying: For the Use of Those Connected with Mines. The molybdic and tungstic acids combine with the soda, forming the respective salts. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations It consists of silica with the tungstic acid. A Text-book of Assaying: For the Use of Those Connected with Mines. This may be got rid of by boiling in aqua regia, and dissolving out the tungstic acid which has been liberated by means of ammonia. A Text-book of Assaying: For the Use of Those Connected with Mines. Treat the residue again with acid, and again dissolve out the separated tungstic acid with ammonia, and repeat this operation until decomposition is complete. A Text-book of Assaying: For the Use of Those Connected with Mines. On treatment with hydrochloric acid or aqua regia they are decomposed; the yellow tungstic acid separates and remains insoluble. A Text-book of Assaying: For the Use of Those Connected with Mines. If the tungstic acid contain iron, the glass becomes blood-red on cooling, similar to titanic acid. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations For the assay of minerals containing tungsten these reactions are only occasionally taken advantage of for testing or purifying the separated tungstic acid. A Text-book of Assaying: For the Use of Those Connected with Mines. The residual tungstic acid is fixed, so that when the ammonia has been driven off it may be strongly heated without loss. A Text-book of Assaying: For the Use of Those Connected with Mines. The tungstate of ammonia requires simple evaporation on the water-bath and gentle ignition in order to cause the tungstic acid to be left in an almost pure state; possibly, it may carry a little silica. A Text-book of Assaying: For the Use of Those Connected with Mines. Any silica present will be left undissolved; it should be separated and weighed, and its weight deducted from that of the tungstic acid found. A Text-book of Assaying: For the Use of Those Connected with Mines. |
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