A Treatise on Chemistry and Chemical Analysis: Quantitative analysisColliery Engineer Company, 1899 |
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طبعات أخرى - عرض جميع المقتطفات
عبارات ومصطلحات مألوفة
100 cubic centimeters 50 cubic add the precipitate added air bath alcohol alkaline Allow the precipitate ammonia ammonium chloride amount apparatus barium beaker blast lamp bottle Bunsen burner burette burn the filter calcium calcium oxide carbon dioxide cent centimeters of concentrate centimeters of water cipitate color concentrate hydrochloric acid continue the boiling cool copper cubic centi current of hydrogen decantation desiccator determination dilute distilled drops Dry the precipitate evaporate to dryness expelled filtrate flask funnel gram grams of pure hot water hydrochloric acid hydrogen sulphide insoluble iron liquid liter manganese method minutes mixed mixture nickel nitric acid oxide permanganate pipette platinum crucible porcelain crucible porcelain dish precipitate precipitate to settle Quantitative Analysis reagent remove residue salt sample silver nitrate slight excess sodium carbonate sodium hydrate solu stand stirring stopper sulphate sulphuric acid temperature tion titrate volume wash the precipitate watch glass water bath water containing weigh zinc
مقاطع مشهورة
الصفحة 217 - As a flash torch, a small gas jet one-quarter of an inch in length, should be employed. When gas is not at hand employ a piece of waxed linen twine. The flame in this case, however, should be small. " When the temperature of the oil has reached 85° F.
الصفحة 110 - Boil with from 20 to 30 cc of strong sulphuric acid, adding from 2 to 4 grams of sodium or potassium nitrate at the beginning of the digestion and a small quantity after the solution has become nearly colorless, or adding the nitrate in small portions from time to time. A Kjeldahl flask marked at 250 cc is recommended.
الصفحة 91 - ... is one of the most important, if not the most important, of its organic ingredients.
الصفحة 101 - Alcohol. — This reagent consists of alcohol of about 95 per cent. strength, redistilled with caustic soda. Acid. — This reagent is a solution of sulphuric acid containing 200 cubic centimeters of strongest sulphuric acid in 1,000 cubic centimeters of water.
الصفحة 217 - The appearance of a slight bluish flame shows that the flashing point has been reached. In every case note the temperature of the oil before introducing the torch. The flame of the torch must not come in contact with the oil.
الصفحة 216 - On the left side of the figure is shown the instrument entire. It consists of a sheet-copper stand 8£ inches high, exclusive of the base, and 4£ inches in diameter. On one side is an aperture 3£ inches high, for introducing a small spirit lamp A or, better, a small Bunscn burner.
الصفحة 119 - Next add 50 cubic centimeters of the soda solution, or sufficient to make the reaction strongly alkaline, pouring it down the side of the flask so that it does not mix at once with the acid solution. Connect the flask with the condenser, mix the contents by shaking, and distill until all ammonia has passed over into the standard acid.
الصفحة 93 - Then decant on filter, wash two or three times with cold water by decantation, and transfer precipitate completely to filter. Wash once or twice on filter. The filtrate should be clear, or very nearly so. If it be not clear when it first runs through, it can generally be made so by two or three repeated filtrations, after which the washing of the precipitate can be completed. Determine nitrogen In the washed precipitate and filter paper by the Kjeldahl or Gunning method ("I. Fertilizers,
الصفحة 103 - ... of boiling water. The flasks should then be placed in a tray by the side of the balance and covered with a silk handkerchief until they are perfectly cool. They must not be wiped with a silk handkerchief within 15 or 20 minutes of the time they are weighed.
الصفحة 97 - ... place a small funnel in the neck of the flask, and heat it moderately, until the action is quite violent.