... hour at the temperature 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 fifteen or twenty... Essentials of volumetric analysis - الصفحة 281بواسطة Henry William Schimpf - 1917 - عدد الصفحات: 366عرض كامل - لمحة عن هذا الكتاب
| United States. Bureau of Chemistry - 1889 - عدد الصفحات: 1396
...perfectly dry on the outside and heated for оно hour to 100° (circa ). Th« fl.-isks should then lie placed in a tray by the side of the balance and covered...until they are perfectly cool. They must not be wiped wilh a silk handkerchief within fifteen or tw enty minutes of the time they are weighed. The weight... | |
| United States. Bureau of Chemistry - 1892 - عدد الصفحات: 790
...alcohol, and ether, wiped pel'ectly dry on the outside, and heated for one hour to boiling temperature. The flasks should then be placed in a tray by the...balance and covered with a silk handkerchief until they arc perfectly cool. They must not be wiped with a silk handkerchief within fifteen or twenty minutes... | |
| United States. Bureau of Chemistry - 1894 - عدد الصفحات: 1004
...Should the filtered fat, iu a fused state, not be perfectly clear, it. must be filtered a second time. The saponification flasks are prepared by thoroughly...The flasks should then be placed in a tray by the eide of the balance and covered with a silk handkerchief until they are perfectly cool. They must not... | |
| Francis Sutton - 1896 - عدد الصفحات: 612
...ether, wiped perfectly dry on the outside, and heated for one hour to 1UO° C. The flasks should llien be placed in a tray by the side of the balance and covered with a silk handkerchief until they :ire perfectly cool. They must not be wiped with a silk handkerchief within fifteen or twenty minutes... | |
| Harvey Washington Wiley - 1897 - عدد الصفحات: 700
...accomplished at 100° in a thin layer in a flat bottom dish, in partial vacuum or an atmosphere of inert gas. The saponification flasks are prepared by thoroughly...one hour at the temperature of boiling water. The hard flasks used in moist combustions with sul furic acid for the determination of nitrogen are well... | |
| Henry William Schimpf - 1898 - عدد الصفحات: 582
...second time. This is to remove all foreign matter and any trace of moisture. The saponification-flasks are prepared by thoroughly washing with water, alcohol,...must not be wiped with a silk handkerchief within 15 or 20 minutes of the time they are weighed. The weight of the flasks having been accurately determined,... | |
| Henry William Schimpf - 1898 - عدد الصفحات: 588
...second time. This is to remove all foreign matter and any trace of moisture. The saponification-flasks are prepared by thoroughly washing with water, alcohol,...must not be wiped with a silk handkerchief within 15 or 20 minutes of the time they are weighed. The weight of the flasks having been accurately determined,... | |
| 1899 - عدد الصفحات: 688
...heated for 1 hour at the temFIG. 32. perature of boiling water. The flasks ; should then be placed on a tray by the side of the balance, and covered with...must not be wiped with a silk handkerchief within 15 or 20 minutes of the time they are weighed. The weight of the flask having been accurately determined,... | |
| Association of Official Agricultural Chemists (U.S.) - 1899 - عدد الصفحات: 96
...Should the filtered fat, in a fused state, not be perfectly clear, it must be filtered a second time. The saponification flasks are prepared by thoroughly...with water, alcohol, and ether, wiping perfectly dry 011 the outside, and heating for one hour at the temperature of boiling water. The flasks should then... | |
| 1902 - عدد الصفحات: 1004
...1 hour at the ternFIG. sz. perature of boiling water. The flasks § 19 107 should then be placed on a tray by the side of the balance, and covered with...must not be wiped with a silk handkerchief within 15 or 20 minutes of the time they are weighed. The weight of the flask having been accurately determined,... | |
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