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" ... 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 281
بواسطة Henry William Schimpf - 1917 - عدد الصفحات: 366
عرض كامل - لمحة عن هذا الكتاب

Bulletin - Bureau of Chemistry, الأعداد 20-29

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...

Bulletin - Bureau of Chemistry, الأعداد 35-40

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...

Bulletin - Bureau of Chemistry, الأعداد 41-47

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...

A Systematic Handbook of Volumetric Analysis; Or, The Quantitative ...

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...

Principles and Practice of Agricultural Analysis: Agricultural products

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...

A Manual of volumetric analysis for the use of pharmacists, sanitary and ...

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,...

A Text-book of Volumetric Analysis: With Special Reference to the Volumetric ...

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,...

A Treatise on Chemistry and Chemical Analysis: Quantitative analysis

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,...

Methods of Analysis Adopted by the Association of Official Agricultural ...

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...

International Library of Technology: A Series of Textbooks for ..., المجلد 17

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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