Introduction to the study of organic chemistry : a text-book for students in the universitites and technical schools / by John Wade.

  • Wade, John.
Date:
1898
Catalogue details

Licence: Public Domain Mark

Credit: Introduction to the study of organic chemistry : a text-book for students in the universitites and technical schools / by John Wade. Source: Wellcome Collection.

    461/490 (page 439)
    form purple. Small crystal of ammonium molybdate to soln. of dry alka- loid in cone, sulphuric acid (cooled), fine blue colour. [.Estimation of Morphine in Opium.—(Tlie morphine is dissolved iu lime- water, pptd. by ammonium chloride, impurities and extractive matter are dissolved out with alcohol, and the alkaloid pptd. in crystalline form from the aqueous soln. by ether). A mixture of 10 grams powdered opium (dried at 100°) with 5 grams slaked lime is thoroughly mixed with 100 c.c. water in a mortar, and after some minutes filtered. (The meconic and resin acids are thus pptd.) The lime-water soln. of the alkaloid is well mixed, and 52 c.c. of it (=5 grams of opium, allowing for the bulk of the latter) is mixed with 6 c.c. dehydrated meth. spirit and 30 c.c. ether in a stoppered vessel and well shaken. 3 grams ammonium chloride next added (ammonia and calcium chloride thus formed), the shaking continued at intervals for half an hour. Nearly all the morphine is thrown down by the ether in crystals in 2 hours, the whole in 12 hours, the impurities remaining in solution in the upper layer of alcohol-ether. The upper layer is pipetted off and passed through a small tared filter, the aqueous residue shaken with 15 c.c. more ether, and the latter again pipetted off, and the crystals on the filter washed twice with 5 c.c. of ether. The filter is now allowed to dry in the air, at the ordinary temperature, and the aqueous layer with the mor- phine crystals transferred to it, the vessel being rinsed on to the filter with 15 c.c. water in small successive portions. The filter is drained and folded up, and dried, first by pressure between filter papers, and finally gradually heated to 100° until its weight is constant.] CHAPTER LXVII [Thiophene.—10 c.c. coml. benzene, 10 c.c. cone, sulphuric acid, contain- ing a small crystal of plienanthraquinone (which make). Note blue.] Dinitrothiopliene.— Make a little meta-dinitrobenzene from “50% ” benzene, and note red colour with alkali. Furfuraldeliyde.—Distil 5 grams chopped straw with 5 c.c. cone, hydro- chloric acid and 100 c.c. water. Note colour of distillate with aniline.