United States or Montenegro ? Vote for the TOP Country of the Week !
Again moisten the residue with concentrated hydrochloric acid, warm gently, making sure that the acid comes into contact with the whole of the residue, dilute to about 200 cc. and bring to boiling. Allow the filter to drain for a few moments, then place a clean beaker below the funnel and wash with water until free from chlorides, discarding these washings.
And with Scorpio so altered ... hmm. Better add two cc. of cortisone to the transfusion." Hanson tried to sit up, but his arms refused to bear his weight. He opened his mouth. A slim hand came to his lips, and he looked up into soothing blue eyes. The nurse's face was framed in copper-red hair.
The German silver wire, N, is traversed by two movable knife-edge contacts, cc, as shown. A resistance of ten units is inserted at o and n, while at m and p twenty units or one thousand units are inserted. The positions of cc are then varied until the galvanometer shows no deflection when the key, T, is depressed.
It should be used in cold, not too dilute, solutions. Its sensitiveness is lessened in the presence of considerable quantities of the salts of the alkalies. A !phenolphthalein solution! is prepared by dissolving 1 gram of the pure compound in 100 cc. of 95 per cent alcohol. This indicator is particularly valuable in the determination of weak acids, especially organic acids.
The liquid became turbid from a development of bacteria and then underwent butyric fermentation. By June 9th the fermentation had become sufficiently active to enable us to collect in the course of twenty-four hours, over mercury, as in all our experiments, about 100 cc.
The earliest of all is the famous letter written by Cassiodorus to the Venetians in the sixth century, which is partly translated in Molmenti, op. cit., I, pp. 14-15. The account of the march of the gilds occupies cc. CCLXIII-CCLXXXIII of Canale's Chronicle, op. cit., pp. 602-26. It has often been quoted. Canale, op. cit., c. CCLXI, p. 600.
Measure off 50 cc. of the solution in a measuring flask, or pipette, either of which before use should, unless they are dry on the inside, be rinsed out with at least two small portions of the soda ash solution to displace any water. If a flask is used, fill it to the graduation with the soda ash solution and remove any liquid from the neck above the graduation with filter paper.
Calculate the percentage of potassium oxide in an impure sample of potassium carbonate from the following data: Weight of sample = 1.00 gram; HCl sol. used = 55.90 cc.; NaOH sol. used = 0.42 cc.; 1 cc. NaOH sol. = 0.008473 gram of KHC O .H C O .2H O; 2 cc. HCl sol. = 5 cc. NaOH sol. !Answer!: 65.68%. NaOH solution = 1.190 cc. HCl solution. !Answer!: 97.97%.
N.B. In this, and the following woodcut, the subsidence of the land could only be represented by an apparent rise in the level of the sea. A'A' Outer edges of the barrier-reef at the level of the sea. The cocoa-nut trees represent coral-islets formed on the reef. CC The lagoon-channel.
It should be added in slight excess only, since the excess must be removed by boiling, which is tedious. !Method C! PROCEDURE. Weigh out into 500 cc. beakers two portions of 0.175-0.200 gram each of pure arsenious oxide. Dissolve each of these in 10 cc. of sodium hydroxide solution, with stirring. Cover the beakers before adding the bicarbonate, to avoid loss.
Word Of The Day