| 单词 | burette |
| 例句 | Mercury is run in from a burette through the side-neck and applies pressure upon the film by gravity. Paint Technology and Tests 2011-09-15T02:00:12.263Z From the reading of the burette the lead is calculated. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" After having boiled for 3 to 4 minutes, N/4 caustic soda is added until the pink color just returns and the amount of caustic soda used is read on the burette. Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. The alkalimeter is merely a graduated tube—a burette—with a stopcock at the lower extremity, from which the standard acid is dropped into water in which a known weight of the substance is dissolved. The New Gresham Encyclopedia. Vol. 1 Part 1 A to Amide And subsequently when the burette is used, the volumes read from the scale on the burette must be corrected. The Methods of Glass Blowing and of Working Silica in the Oxy-Gas Flame For the use of chemical and physical students When, however, a pipette or burette has to be calibrated to deliver a certain volume of water, the final calibration must be made with this liquid. A Handbook of Laboratory Glass-Blowing A standardized solution of ammonium molybdate is then added from a burette. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" The burette consists of two hollow tubes of glass. The Cultivation of The Native Grape, and Manufacture of American Wines The tip of the burette is allowed to fill before the readings are made, which are from the lowest point or meniscus. Human Foods and Their Nutritive Value A burette may be calibrated by filling it with distilled water, drawing off portions, say of 5 c.c. in succession, into a weighing bottle of known weight, and weighing them. The Methods of Glass Blowing and of Working Silica in the Oxy-Gas Flame For the use of chemical and physical students The burette is now filled with a solution of potassium bichromate and sulphuric acid and allowed to soak for some time; the bichromate is washed out and distilled water is put in. A Handbook of Laboratory Glass-Blowing The levels of the two liquids are then brought to the zero marks of the burettes by means of the stopcocks. An Elementary Study of Chemistry The cyanide solution is now run in from a burette until the solution clears, after which an excess of about 20 c.c. is added. A Text-book of Assaying: For the Use of Those Connected with Mines. Weigh out 15 gms. of soft wheat flour into an evaporating dish; then add from burette a measured quantity of water sufficient to make a stiff dough. Human Foods and Their Nutritive Value The best plan is to hold a piece of white paper behind the burette, and to read from the lower edge of the black line that will be seen. The Methods of Glass Blowing and of Working Silica in the Oxy-Gas Flame For the use of chemical and physical students The size of the bore-hole is measured by filling the cavity with water from a burette. Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 The measurements of the permanganate were made from a burette which had been carefully calibrated. Scientific American Supplement, No. 561, October 2, 1886 It is this difference in the readings of the two burettes which measures the quantity of nickel present. A Text-book of Assaying: For the Use of Those Connected with Mines. Run in standard KOH solution from a burette until a faint pink tinge remains permanently. Human Foods and Their Nutritive Value When the burette is filled with soda solution half-way up the funnel Y, A and C are closed, and B opened. Nitro-Explosives: A Practical Treatise A burette is made from a glass tube which is as uniformly cylindrical as possible, and of such a bore that the divisions which are etched upon its surface shall correspond closely to actual contents. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Small Gay-Lussac burettes may then be used in the titration of only 0.010 meter internal diameter, and graduated into one-twentieth c. c., which allows of great exactitude in the determination. Scientific American Supplement, No. 401, September 8, 1883 Do not remove the drop on the point of the burette with the test-rod; let it remain where it is or drop it into the solution by carefully opening the clip. A Text-book of Assaying: For the Use of Those Connected with Mines. From the burette run in N/10 KOH solution until a faint pink tinge remains permanently. Human Foods and Their Nutritive Value The clip E is now closed, and tube i is put underneath the burette, and the development of NO gas is commenced by heating the contents of the flask f. Nitro-Explosives: A Practical Treatise Burettes of the latter type will be referred to as "plain burettes." An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes When it is desired to make an analysis of smoke due to combustion, caustic potassa is first sucked into the burette. Scientific American Supplement, No. 360, November 25, 1882 If the burette is filled from the top, the float rises with aggravating slowness, and this is its chief disadvantage. A Text-book of Assaying: For the Use of Those Connected with Mines. A convenient plan for filling a burette from below is shown in fig. A Text-book of Assaying: For the Use of Those Connected with Mines. To fill the apparatus with the soda solution, the gas burette is put on the indiarubber stopper of basin W, and firmly clamped down. Nitro-Explosives: A Practical Treatise It should be attached to the burette by means of a wire, or elastic band, to lessen the danger of breakage. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes To make a quantitative analysis of the carbon contained in gas, the pyrogallate of potash must be entirely removed from the burette. Scientific American Supplement, No. 360, November 25, 1882 The flow of liquid into the burette is controlled by the clip. A Text-book of Assaying: For the Use of Those Connected with Mines. The bottle containing the standard solution is connected with the burette by a syphon arrangement through the glass tube and T-piece. A Text-book of Assaying: For the Use of Those Connected with Mines. The cork is perforated, and in the perforation is placed a glass tube which communicates with the burette. A Text-book of Assaying: For the Use of Those Connected with Mines. Fill the burette to a point above the zero-point and draw off the water until the meniscus is just below that mark. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Water is allowed to flow through the point of the tube, B, while from the flask, F, it enters through the bottom into the burette, so as to drive out the gas. Scientific American Supplement, No. 360, November 25, 1882 When this clip is opened, the burette fills; and when it is closed, the burette is ready for use in the ordinary way. A Text-book of Assaying: For the Use of Those Connected with Mines. The burette is connected by a rubber tube and a Y-piece, either with another burette or with a piece of ordinary combustion-tube of about the same size. A Text-book of Assaying: For the Use of Those Connected with Mines. The liquid in the two burettes is next brought to the same level, either by pouring it in at a or running it out at b. A Text-book of Assaying: For the Use of Those Connected with Mines. All liquids when placed in a burette form what is called a meniscus at their upper surfaces. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes If not enough absorbing liquid has entered, there may be sucked into the burette, by the process described above, a new quantity of liquid. Scientific American Supplement, No. 360, November 25, 1882 Of course 5 c.c. must be deducted from the reading on the burette. A Text-book of Assaying: For the Use of Those Connected with Mines. Next, after seeing that the level of the liquid in the burette has not changed, turn the bottle over on its side so that the re-agent in the test-tube shall be upset into the bottle. A Text-book of Assaying: For the Use of Those Connected with Mines. When the action has finished bring the liquid in the two vessels to the same level and read off the burette. A Text-book of Assaying: For the Use of Those Connected with Mines. Similarly, a burette used for the titration of the 50 cc. of solution removed should be calibrated under the same conditions as the measuring flasks or pipettes employed with it. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes After this, water is poured into the funnel, t, and the burette is put in communication with the gas reservoir by means of a rubber tube. Scientific American Supplement, No. 360, November 25, 1882 Run in 47 or 48 c.c. of the "ferrocyanide" solution from an ordinary burette, and finish off cautiously. A Text-book of Assaying: For the Use of Those Connected with Mines. On running the solution from the burette into the assay, do not let it run down the side of the flask. A Text-book of Assaying: For the Use of Those Connected with Mines. Next, a standard solution of the metal being estimated is run in from a burette, the mixture being stirred after each addition until the colour approaches that of the assay. A Text-book of Assaying: For the Use of Those Connected with Mines. Place the flask under the burette and draw out into it about 10 cc. of water, removing any drop on the tip by touching it against the inside of the neck of the flask. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Thus, to analyze CO, a portion of the liquid is removed from the burette, then caustic potash is allowed to enter, and the process goes on as explained above. Scientific American Supplement, No. 360, November 25, 1882 Run into a flask 50 c.c. of the standard "acid," tint with methyl orange, and run in from a burette the solution of ammonia till neutralised. A Text-book of Assaying: For the Use of Those Connected with Mines. Next, the amount added is read off from the burette, still more is poured in until the colour is slightly darker than that of the assay, and the burette read off again. A Text-book of Assaying: For the Use of Those Connected with Mines. Fill an ordinary burette with the weaker standard salt solution, and run 1 c.c. into the assay bottle, letting it run down the side so that it forms a layer resting on the assay solution. A Text-book of Assaying: For the Use of Those Connected with Mines. If the titration has occupied more than the three minutes required for draining the sides of the burette, the final reading may be taken immediately and recorded in the notebook. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes There are then 100 cubic centimeters in the burette. Scientific American Supplement, No. 360, November 25, 1882 Total acidity.—Weigh out 11.2 grams of the ore, place them in a four-inch evaporating dish and measure on to it from a burette 10 or 20 c.c. of the standard solution of soda. A Text-book of Assaying: For the Use of Those Connected with Mines. Then run out cautiously until the level of the liquid in the burette stands at zero. A Text-book of Assaying: For the Use of Those Connected with Mines. The accuracy of the reading of a burette is sensibly increased by the use of an Erdmann float. A Text-book of Assaying: For the Use of Those Connected with Mines. From the records of calibration already obtained, correct the burette readings and make corrections for temperature, if necessary. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The combustion is effected by causing the mixture of gas to pass from the burette into the tube, B, through the tube, v, heated to redness, into which there passes a palladium wire. Scientific American Supplement, No. 360, November 25, 1882 The assay without iodide.—The standard solution of silver nitrate is placed in a small burette divided into tenths of a c.c. A Text-book of Assaying: For the Use of Those Connected with Mines. Run 50 c.c. of the clear liquor from a burette into an 8 oz. flask; add 2 or 3 c.c. of soda solution and 3 drops of potassium iodide. A Text-book of Assaying: For the Use of Those Connected with Mines. Fill a burette with the standard cyanide solution. A Text-book of Assaying: For the Use of Those Connected with Mines. If the variation in results is greater than this, refill the burettes and repeat the titration until satisfactory values are obtained. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes While the water is flowing through b, the burette becomes filled with gas. Scientific American Supplement, No. 360, November 25, 1882 The assay with iodide.—The standard solution of silver nitrate is placed in a burette divided into tenths of a c.c. A Text-book of Assaying: For the Use of Those Connected with Mines. It is best contained in a pint flask, and the standard chromate solution used with an ordinary burette. A Text-book of Assaying: For the Use of Those Connected with Mines. Run in from a burette, slowly and with stirring, "magnesia mixture," using about 15 c.c. for each 0.1 gram of phosphoric oxide. A Text-book of Assaying: For the Use of Those Connected with Mines. Run in acid from the burette, stirring and avoiding loss by effervescence, until the solution has become pink. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Fill an ordinary burette with the uranium acetate solution, and run into the assay a quantity known to be insufficient. A Text-book of Assaying: For the Use of Those Connected with Mines. The burette with syphon arrangement, figured on page 52, is used. A Text-book of Assaying: For the Use of Those Connected with Mines. Fill an ordinary 100 c.c. burette with the solution of barium chloride. A Text-book of Assaying: For the Use of Those Connected with Mines. Run out the water so as to keep the level in the two burettes the same. A Text-book of Assaying: For the Use of Those Connected with Mines. One burette of each type is desirable for the analytical procedures which follow. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes When effervescence has ceased, rotate the contents of the bottle; finally, adjust the level in the burettes and read off the volume. A Text-book of Assaying: For the Use of Those Connected with Mines. The amount of iron will be the same in each tube; that in the standard may be known by reading off the volume from the burette and multiplying by 0.01 milligram. A Text-book of Assaying: For the Use of Those Connected with Mines. Run this from a burette into the flask until the colour equals that of the assay. A Text-book of Assaying: For the Use of Those Connected with Mines. Tint with methyl orange, and run in from an ordinary burette normal solution of sulphuric acid until a pink tint is got. A Text-book of Assaying: For the Use of Those Connected with Mines. The inner surface of a burette must be thoroughly cleaned in order that the liquid as drawn out may drain away completely, without leaving drops upon the sides. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes When it is completed, refill the burette and check the first calibration. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Read off the level of the liquid in the graduated burette. A Text-book of Assaying: For the Use of Those Connected with Mines. From the final data, plot the corrections to be applied so that they may be easily read for each cubic centimeter throughout the burette. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The total correction at each 10 cc. may also be written on the burette with a diamond, or etching ink, for permanence of record. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Remove the stopper and pour the solution into a stock bottle to be kept for further use, and rinse out the burette with water several times. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Then fill the burette with the acid solution. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The standard solution must be put in a burette with a glass stopcock, as it attacks india-rubber. A Text-book of Assaying: For the Use of Those Connected with Mines. Carry out the same procedure with a second burette, using the sodium hydroxide solution. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes It is preferable to use a plain burette for this solution. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes If the burette has a glass stopcock, this should be removed after the cleaning and wiped, and also the inside of the ground joint. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Fill the burettes with the standard acid and alkali solutions, noting the initial readings of the burettes and temperature of the solutions. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Add a few drops of potassium iodide solution, and run in the standard solution of silver nitrate from a burette. A Text-book of Assaying: For the Use of Those Connected with Mines. Note the readings of the burettes after the proper interval, and record them in the notebook. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes PROCEDURE.—Fill one burette with each of the solutions, observing the general procedure with respect to cleaning and rinsing already prescribed. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes It is not well to attempt to bring the meniscus exactly to a division mark on the burette. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The bichromate solution is preferably to be placed in a glass-stoppered burette. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes At the same time read off the volume of air in the "volume corrector," which must be fixed alongside the gas burettes. A Text-book of Assaying: For the Use of Those Connected with Mines. From the volumes of the solutions used, after applying corrections for burette readings, and, if need be, for the temperature of solutions, calculate the value of the ferrous solution in terms of the oxidizing solution. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes PROCEDURE.—Fill a glass-stoppered burette with the permanganate solution, observing the usual precautions, and fill a second burette with the ferrous sulphate solution prepared for use with the potassium bichromate. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The bore of burettes is subject to accidental variations, and since the graduations are applied by machine without regard to such variations of bore, local errors result. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The permanganate solution cannot be used in burettes with rubber tips, as a reduction takes place upon contact with the rubber. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Fill one burette with this and another with the solution of silver nitrate. A Text-book of Assaying: For the Use of Those Connected with Mines. On the other hand, the excess of oxalic acid should not be so large as to react with more of the permanganate solution than is contained in a 50 cc. burette. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Then run in the permanganate solution from a pipette or burette to determine roughly the amount required. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Two burettes, one at least of which should have a glass stopper, are required throughout the volumetric work. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Repeat until the ratio of the two solutions is established, remembering all necessary corrections for burettes and for temperature changes. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes When using a burette, the water must be run out; the burette is next rinsed with some of the solution to be used, and drained; and then it is filled with the solution. A Text-book of Assaying: For the Use of Those Connected with Mines. Run in the arsenite solution from a burette until no further reaction takes place on the starch-iodide paper when touched by a drop of the solution of bleaching powder. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The total correction thus found is subtracted from the observed burette reading if the temperature is higher than the standard, or added, if it is lower. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes Both burettes should be calibrated by the student to whom they are assigned. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes |
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