Johns Hopkins Hospital Bulletin Volume 26

Johns Hopkins Hospital Bulletin Volume 26

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: rapidly cooled under the cold water faucet witliout shaking, and the contents immediately poured on the filter. The reduced copper oxide remains in part adherent to the sides of the Erlenmeyer flask and to the surface of the asbestos filter, and both flask and filter must be carefully washed several times with distilled water. The funnel is then disconnected from the filtrate flask containing the unreduced copper sulphate and the washings. The filtrate flask is thoroughly cleansed with distilled water and again connected up with the funnel. Three cubic centimeters of the acid ferric sulphate solution are now added to the original Erlenmeyer flask, care being taken that it is well distributed over the Whole of the inside of the flask. The contents of the flask are then poured upon the asbestos in the funnel and allowed to stand 1 minute. By this time all the reduced copper will have been taken into solution, and the suction pump is again started. The Erlenmeyer flask is carefully washed 3 or-1 times with 3 to 5 cc. of distilled water, each washing being poured into. the funnel of the suction pump. The contents of the filtrate flask are then titrated against the permanganate solution diluted 1: 10, until a definite pink color persists. The results are easily figured. The amount of permanganate solution in cubic centimeters is multiplied by the constant for this solution (as previously determined) and its equivalent in milligrams of dextrose obtained from the following table: Copper. Sugar. Copper. Sugar. Copper. Sugar. 1.95 1.0 3.50 1.8 5.00 2.6 2.15 1.1 3.70 1.9 5.20 2.? 2.35 1.2 3.85 2.0 5.40 2.3 2.55 1.3 4.05 2.1 5.60 2.9 2.75 1.4 4.25 2.2 5.75 3.0 2.90 1.5 4.45 2.3 5.95 3.1 3.10 1.6 4.65 2.4 6.15 3.2 3.30 1.7 4.80 2.5 6.35 3.3 But more

Product details

  • Paperback | 414 pages
  • 189 x 246 x 22mm | 735g
  • United States
  • English
  • black & white illustrations
  • 123674411X
  • 9781236744111