Summarized Proceedings and a Directory of Members Volume 12 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1859 Excerpt: ... in which chlorine was still easily detected, but on moistening the residue with the same nitric acid and reevaporating, no trace of chlorine was found in the second residue. With crystallized chlorid of magnesium the same results were obtained. Two evaporations with excess of acid seem to be sufficient under ordinary circumstances to complete the decomposition, and in favorable conditions it may be effected by one. Thus pure crystals of the chlorid Mg Cl-j6 HO, dried by pressure between folds of paper, were heated with nitric acid of sp. gr. 1.43. They quickly dissolved to a clear solution, which when evaporated to dryness, left a residue containing no trace of chlorine. Pure crystals of chlorid of magnesium, heated with excess of nitric acid of sp. gr. 1.29, began to give off gas in minute bubbles at 60 C, quickly dissolving to a clear yellow solution. The evolution of gas however was not copious even-at 100 C; but on heating a little above this temperature, it became rapid and violent, the color of the gas given off being a brownish-yellow. On gradual cooling, the gas ceased to be formed at about 75 C As in the case of chlorid of sodium, an attempt was made to collect the gas over hot water, which failed for the same reason as in that case. On cooling to the temperature of the air, no change took place in the liquid, and none on the addition of alcohol in large quantity. 5. Calcium.--Experiments were made with a concentrated solution of the pure chlorid, with the crystals, and with the anhydrous salt. In each case, one evaporation expelled every trace of chlorine. 6. Strontium.--Parallel experiments, as in the case of calcium, were made with this chlorid in solution, crystallized and dry, and with similar results. 7. Barium.--With the chlorid in solution...