Household Chemistry for the Use of Students in Household Arts
Household Chemistry for the Use of Students in Household Arts
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In our eReader you can find the full English version of the book. Read Household Chemistry for the Use of Students in Household Arts Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Household Chemistry for the Use of Students in Household Arts
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Determine caffein in the balance of the extract as follows : Add basic acetate of lead as long as a HOUSEHOLD CHEMISTRY 177 precipitate appears, filter, wash slightly, reject the residue, add Na 2 HPO4 solution to the clear filtrate to precipitate excess of lead as phosphate, and wash. Concentrate the filtrate to small bulk (25 cc. ), cool, transfer to a separatory funnel and add 5-10 cc. Of chloroform. Mix well, and after settling draw off the chloroform layer into a weighed porcelain dish and... drive off the solvent over hot water. Cool and weigh. Caffein crys- tallizes in minute colorless needles, possessing a bitter taste.
After removing the chloroform, evaporate some of the tea extract in a clean porcelain dish over hot water and note the large amount of residue, also its color and gummy nature.
Coffee consists of the dried, fermented and roasted beans of the Caffea arabica an evergreen shrub. In the roasting process flavor is increased owing to the con- version of a carbohydrate constituent to caramel, and the development of caffeol, an oil to which much of the aroma of coffee is due.
What to read after Household Chemistry for the Use of Students in Household Arts?
You can find similar books in the "Read Also" column, or choose other free books by Hermann T Hermann Theodore Vult to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Determine caffein in the balance of the extract as follows : Add basic acetate of lead as long as a HOUSEHOLD CHEMISTRY 177 precipitate appears, filter, wash slightly, reject the residue, add Na 2 HPO4 solution to the clear filtrate to precipitate excess of lead as phosphate, and wash. Concentrate the filtrate to small bulk (25 cc. ), cool, transfer to a separatory funnel and add 5-10 cc. Of chloroform. Mix well, and after settling draw off the chloroform layer into a weighed porcelain dish and... drive off the solvent over hot water. Cool and weigh. Caffein crys- tallizes in minute colorless needles, possessing a bitter taste.
After removing the chloroform, evaporate some of the tea extract in a clean porcelain dish over hot water and note the large amount of residue, also its color and gummy nature.
Coffee consists of the dried, fermented and roasted beans of the Caffea arabica an evergreen shrub. In the roasting process flavor is increased owing to the con- version of a carbohydrate constituent to caramel, and the development of caffeol, an oil to which much of the aroma of coffee is due.
What to read after Household Chemistry for the Use of Students in Household Arts?
You can find similar books in the "Read Also" column, or choose other free books by Hermann T Hermann Theodore Vult to read onlineMoreLess
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