Contribution to the Knowledge of Japanese Lac Ki Urushi
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092 0. 032 _-2 9 Yoshida has named this substance oxy-urushic acid and giv- en it the formula C 14 H 18 O 3, but as it has none of the properties of an acid I have called it oxy-urushin. Owing to the presence of nitrogen I am loth to suggest a change in the formula. That nitrogen is present has been proved (beyond doubt) by the meth- ods more fully given under gum-enzyme. That nitrogen is in actual combination is supported by the fact that it is separable only by fusing with dry fixed alkali, o...r incompletely by long boiling with a solution of fixed alkali. Owing to the small amount of nitrogen present, a very slight error in estimation would ma- terially affect the results from calculation of a molecular formula.
The Kjeldahl method could not be used for the determina- tion of the nitrogen, hence the necessity of using the Dumas method. The principal objection to this method is the difficulty of completely removing the air from the fine copper oxide. After numerous experiments the substance was finally mixed with cop- per oxide in fine powder and placed in a copper boat which was then placed in the combustion tube and the air removed by car- bon dioxide, generated from sulphuric acid and potassium car- bonate by Thiele's method 15 .
What to read after Contribution to the Knowledge of Japanese Lac Ki Urushi?
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To quickly assess the difficulty of the text, read a short excerpt:
092 0. 032 _-2 9 Yoshida has named this substance oxy-urushic acid and giv- en it the formula C 14 H 18 O 3, but as it has none of the properties of an acid I have called it oxy-urushin. Owing to the presence of nitrogen I am loth to suggest a change in the formula. That nitrogen is present has been proved (beyond doubt) by the meth- ods more fully given under gum-enzyme. That nitrogen is in actual combination is supported by the fact that it is separable only by fusing with dry fixed alkali, o...r incompletely by long boiling with a solution of fixed alkali. Owing to the small amount of nitrogen present, a very slight error in estimation would ma- terially affect the results from calculation of a molecular formula.
The Kjeldahl method could not be used for the determina- tion of the nitrogen, hence the necessity of using the Dumas method. The principal objection to this method is the difficulty of completely removing the air from the fine copper oxide. After numerous experiments the substance was finally mixed with cop- per oxide in fine powder and placed in a copper boat which was then placed in the combustion tube and the air removed by car- bon dioxide, generated from sulphuric acid and potassium car- bonate by Thiele's method 15 .
What to read after Contribution to the Knowledge of Japanese Lac Ki Urushi?
You can find similar books in the "Read Also" column, or choose other free books by Alviso Burdett Stevens to read onlineMoreLess
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