A popular chemistry; . the difference between liquid ammonia and liquor ammoniae ? 38 INORGANIC CHEMISTRY. HYDROGEN. Symbol, H Atomic Weight, 1 Specific Gravity, .069. Hydrogen means literally a generator of — H forms one ninth the weight ofwater, and is a constituent of all animal and vegeta-ble substances. Fig. 13. Preparation.—It maybe obtained from water bymeans of the electric cur-rent, or by the action ofcertain metals. If an elec-tric current be led throughacidulated water, H is givenoff at the negative poleand 0 at the positive a small piece of sodiumis thrown
A popular chemistry; . the difference between liquid ammonia and liquor ammoniae ? 38 INORGANIC CHEMISTRY. HYDROGEN. Symbol, H Atomic Weight, 1 Specific Gravity, .069. Hydrogen means literally a generator of — H forms one ninth the weight ofwater, and is a constituent of all animal and vegeta-ble substances. Fig. 13. Preparation.—It maybe obtained from water bymeans of the electric cur-rent, or by the action ofcertain metals. If an elec-tric current be led throughacidulated water, H is givenoff at the negative poleand 0 at the positive a small piece of sodiumis thrown on water, itmelts and rolls over its surface like a tiny silverball. If the water be heated, the ball bursts into abright yellow blaze. If potassiumbe used instead of sodium, the Hcatches fire at once, even on coldwater, and burns with some vola-tilized K, which tinges the flamewith a beautiful purple tint.* Ifthe water be examined after the action is over, itis found to feel soapy, to turn red litmus paper blue,. Preparing hydrogen. Fig. 14. K on * Cut the metal in small pieces and cover it with a receiver, since themelted globule bursts at the close of the experiment. HYDROGEN. 39 and to leave, on evaporation, a white white substance is KOH or NaOH, potassium orsodium hydroxide. The formation of this substanceand of H by the action of Na on water is representedas follows: H20 + Na = NaOH + H. The H made in this way may be collected in aninverted test tube full of water by imprisoning theglobule of Na in a cage of wire gauze beneath themouth of the tube. H is usually prepared, however, from sulphuricacid (H2S04) by the action of zinc. The reaction isas follows : H2S04 + .Zn = ZnS04 + 2H. The ZnS04 (zinc sulphate) is contained in the solu-tion which remains, and may be obtained in crystalsby evaporating off the water. Properties.—H prepared in this manner has a dis-agreeable odor, from impurities which it contains.*When pure, it is, like 0, colorless,
Size: 1549px × 1613px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade18, booksubjectchemistry, bookyear1887
