| 单词 | stannous |
| 例句 | For example, you may see the words stannous fluoride on a tube of toothpaste. Chemistry 2019-02-14T00:00:00Z For gingivitis, Consumer Reports’ consultants advise that you consider a mouth rinse with stannous fluoride, cetylpyridinium chloride or the essential oils thymol, menthol, eucalyptol and methyl salicylate. Whitener, sensitive teeth, plaque fighter: How to choose a toothpaste 2016-10-28T04:00:00Z “I would tell my patients if they are concerned about triclosan that stannous fluoride is also very effective for reducing plaque and gingivitis,” said Dr. Niederman. Why Your Toothpaste Still Has Triclosan 2016-09-07T04:00:00Z They were separated into three groups, one assigned to a toothpaste without antibacterial properties and the others assigned to antibacterial toothpastes containing either stannous fluoride or triclosan. Toothpaste-Mouth Rinse Combo Washes Out Harmful Bacteria 2015-02-18T05:00:00Z In solution minute quantities of gold may be detected by the formation of “purple of Cassius,” a bluish-purple precipitate thrown down by a mixture of ferric and stannous chlorides. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z The colour is developed gradually as the temperature rises; it may be rendered brighter by the addition of stannous chloride. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z It is prepared from nitrobenzene by reducing it with stannous chloride and sodium hydroxide. The New Gresham Encyclopedia. Vol. 1 Part 3 Atrebates to Bedlis Fourth, they are precipitated from their solutions by many metallic salts, such as lead acetate, stannous chloride, potassium bichromate, etc. The Chemistry of Plant Life Boiling with stannous chloride solution reduces it to the metal; digestion with potassium iodide gives mercurous iodide. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" Solutions of stannous chloride and ferric chloride with the aid of heat ought entirely to destroy the blue coloring matter. Scientific American Supplement, No. 647, May 26, 1888 The constitution of methyl orange follows from the fact that on reduction by stannous chloride in hydrochloric acid solution it yields sulphanilic acid and para-aminodimethyl aniline. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1 "Austria, Lower" to "Bacon" Another preparation of tin is known as stannous gold; it is manufactured in heavy sheets and used the same as cohesive gold foil, and can be easily manipulated, for it is rather plastic. Tin Foil and Its Combinations for Filling Teeth Two per cent of stannous chloride added to the mordant gives brilliancy and fastness to the colour. Vegetable Dyes Being a Book of Recipes and Other Information Useful to the Dyer The ease with which stannous chloride takes up chlorine to form stannic chloride makes it a good reducing agent in many reactions, changing the higher chlorides of metals to lower ones. An Elementary Study of Chemistry This solution is used for standardising the stannous chloride when required; and must be carefully prepared; and tested for the presence of nitric acid. A Text-book of Assaying: For the Use of Those Connected with Mines. Another process is to boil the gun-cotton, &c., in a solution of sodium stannate made by adding caustic soda to a solution of stannous chloride, until the precipitate first formed is just re-dissolved. Nitro-Explosives: A Practical Treatise The procedures, as here prescribed, are applicable to iron ores in general, provided these ores contain no constituents which are reduced by zinc or stannous chloride and reoxidized by permanganates. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Rocelline affords the same reactions as artificial ponceau, but if steeped in a concentrated solution of stannous chloride it is in time completely discharged, which is not the case with artificial ponceau. Scientific American Supplement, No. 363, December 16, 1882 Write symbols for its two chlorides, stannous and stannic, also for its sulphides and oxides. An Introduction to Chemical Science Tin in solution as stannic or stannous chloride is precipitated as metal by means of zinc. A Text-book of Assaying: For the Use of Those Connected with Mines. The ignited precipitate is then dissolved with sulphuric and hydrochloric acids; and the iron determined in the solution by titration with the solution of stannous chloride. A Text-book of Assaying: For the Use of Those Connected with Mines. Proceed with the solution of the ore, treat the residue, if necessary, and reduce the iron by the addition of stannous chloride, followed by mercuric chloride, as described for the bichromate process on page 56. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Moreover, it is turned greenish by stannous chloride. Scientific American Supplement, No. 363, December 16, 1882 A large excess of the stannous chloride must be avoided. A Text-book of Assaying: For the Use of Those Connected with Mines. The rest is recovered, after the removal of the stannous sulphide, by evaporating to dryness, taking up with hydrochloric acid, and filtering through the same filter. A Text-book of Assaying: For the Use of Those Connected with Mines. These reactions are characteristic of tin as stannous chloride. A Text-book of Assaying: For the Use of Those Connected with Mines. How many grams of stannous chloride are there in a liter of solution if it requires 9.47 cc. to just reduce the iron in the above? An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The antimony is precipitated as metal, and the tin remains in solution as stannous chloride. A Text-book of Assaying: For the Use of Those Connected with Mines. A solution of tungstate acidulated with hydrochloric acid becomes intensely blue on the addition of stannous chloride and warming. A Text-book of Assaying: For the Use of Those Connected with Mines. Uranic salts, on the other hand, are easily reduced by sulphuretted hydrogen, stannous chloride or zinc. A Text-book of Assaying: For the Use of Those Connected with Mines. Boil, and run in the stannous chloride solution until the colour is faintly yellow; boil again, and continue the addition of the stannous chloride solution, stirring continuously until the solution appears colourless. A Text-book of Assaying: For the Use of Those Connected with Mines. What is the normal value of the stannous chloride solution as a reducing agent? An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Note the quantity of the stannous chloride solution required. A Text-book of Assaying: For the Use of Those Connected with Mines. It is used for destroying an excess of stannous chloride; for removing sulphuretted hydrogen from solution; and as a test for stannous salts. A Text-book of Assaying: For the Use of Those Connected with Mines. Effect of Varying Tin.—A new solution of stannous chloride was used. A Text-book of Assaying: For the Use of Those Connected with Mines. |
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