On the action of nitric acid on various vegetables : with a more particular examination of Spartium scoparium, Linn., or common broom / by John Stenhouse.

  • Stenhouse, John, 1809-1880.
Date:
1851
Catalogue details

Licence: Public Domain Mark

Credit: On the action of nitric acid on various vegetables : with a more particular examination of Spartium scoparium, Linn., or common broom / by John Stenhouse. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    18/22 (page 428)
    The preceding determinations of the platinum were made with the salt prepared at several different times. I. 0*4879 grm. salt gave 0*475 carbonic acid and 0*217 water. II. 0*3573 grm. salt gave 0*345 carbonic acid and 0*1528 water. 0*8531 grm. salt gave 1*06 Cl Ag=0*2621 Cl =30*72 per cent, chi 13 C Calculated numbers. 1125*00 26*38 I. 26*55 II. 26*33 16 H 200*00 4*68 4*99 4*74 N 175*20 4*10 2 O 200*00 4*73 Pt 1233*50 28*93 28*76 28*76 3 Cl 1329*60 31*18 30*72 30*72 4263*30 100*00 The double chloride of sparteine and platinum, when dried in vacuo, has therefore the following formula, C15 H13 N, Cl H+Pt Cl2+2HO. As it was plain from the result of these analyses that the double chloride of platinum and sparteine, when dried in vacuo, contained 2 equivs. of water, it was transferred to the water-bath and heated to 212° Fahr. ; and as it continued to give off its water very slowly, it was exposed for twelve hours to a temperature of 266° Fahr., when it lost 5*54 per cent, water. The salt then ceased to lose any additional weight, and was not decomposed, though the heat was raised to 300° Fahr. 1*892 grm. salt lost 266° Fahr., 0*105 grm. =5*54 per cent, water; the calculated quantity for 2 equivs. of water is 5*57 per cent. Double Chloride of Mercury and Sparteine. When a solution of hydrochlorate of sparteine was added to a tolerably concen- trated solution of corrosive sublimate, a white crystalline precipitate was immediately produced. This was collected on a filter, washed, and then dissolved in dilute hydrochloric acid. On the cooling of the solution, the double chloride crystallized in right rhombic prisms of considerable size and very high lustre. Through the kindness of Professor W. H. Miller of Cambridge, to whom I have been often indebted for similar obligations, I am enabled to subjoin an exact figure of these crystals, together with the measurements of their angles.