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Nordhausen Sulphuric Acid

This is also known as fuming sulphuric acid.

It is a brown, oily liquid, which fumes in the air, is intensely corrosive, and has a specific ammonia to the acid, and heating to ebullition gravity of about 1.900, and is chiefly used for dissolving indigo. It is prepared by distilling calcined sulphate of iron (green vitriol) in an earthen retort. 3859. Table Showing the Percentage of Liquid and Dry Sulphuric Acid in Dilute Acid at Different Densities.

Liquid. Sp. Gr. Dry. Liquid. Sp. Gr. 83 1.7465 67.68 33 for a few minutes. In this way the most impure acid may be rendered absolutely free from nitric acid and nitrous oxide.

Arsenic can be got rid of by adding a little sulphuret of barium, or of copper foil, to the acid, agitating the mixture well, and, after repose, decanting or distilling it.

Saline matter may be removed by simply The distillation Dry. redistilling (rectification.) The distillation 1.2654 29.35 1.2572.28.54 1.2490 27.72 100 1.8485 81.54 50 1.3884 40.77 99 1.8475 80.72 49 1.3788 39.95 98 1.8460 79.90 48 1.3697 39.14 97 1.8439 79.09 47 1.3612 38.32 96 1.8410 78.28 46 1.3530 37.51 95 1.8376 77.46 45 1.3440 36.69 94 1.8336 76.65 44 1.3345 35.88 93 1.8290 75.83 43 1.3255 35.06 92 1.8233 75.02 42 1.3165 34.25 91 1.8179 74.20 41 1.3080 33.43 90 1.8115 73.39 40 1.2999 32.61 89 1.8043 72.57 39 1.2913 31.80 88 1.7962 71.75 38 1.2826 30.98 87 1.7870 70.94 37 1.2740 30.17 86 1.7774 70.12 36 85 1.7673 69.31 35 84 1.7570 68.49 34 1.2409 26.91 82 1.7360 66.86 32 1.2334 26.09 81 1.7245 66.05 31 1.2260 25.28 80 1.7120 65.23 30 1.2184 24.46 79 1.6993 64.42 29 1.2108 23.65 78 1.6870 63.60 28 1.2032 22.83 77

1.6750 62.78 27 1.1956 22.01 76 1.6630 61.97 26 1.1876 21.20 75 1.6520 61.15 25 1.1792 20.38 74 1.6415 60.34 24 1.1706 19.57 73 1.6321 59.52 23 1.1626 18.75 72 1.6204 58.71 22 1.1549 17.94 71 1.6090 57.89 21 1.1480 17.12 70 1.5975 57.08 20 1.1410 16.31 69 1.5868 56.26 19 1.1330 15.49 68 1.5760 55.45 18 1.1246 14.68 67 1.5648 54.63 17 1.1165 13.86 66 1.5503 53.82 16 1.1090 13.05 65 1.5390 53.00 15 1.1019 12.23 64 1.5280 52.18 14 1.0953 11.60 63 1.5170 51.37 13 62 1.5066 50.55 12 61 1.4960 49.74 11 1.0743 8.97 60 1.4860 48.92 10 1.0682 8.15 59

1.4760 48.11 9 1.0614 7.34 58 1.4660 47.29 8 1.0544 6.52 57 1.4560 46.48 7 1.0477 5.71 56 1.4460 45.66 6 1.0405 4.89 55 1.4360 44.85 5 1.0336 4.08 54 1.4265 44.03 4 1.0268 3.26 53 1.4170 43.22 3 52 1.4073 42.40 2 42 51 1.3977 41,58 1 1.0887 10.41 1.0809 9.78 is best conducted on the small scale, in a glass retort containing a few platinum chips, heated by a sand-bath or gas flame, rejecting the first 1/2 fluid ounce that comes over. 3861. Test for Nitric Acid in Sulphuric Acid. Place in a watch glass a small portion pure and concentrated sulphuric acid at a density of 1.84; then pour, drop Ly drop, half the quantity of a solution of sulphate of aniline, prepared by mixing commercial aniline with diluted sulphuric acid. A glass rod is dipped in the liquid to be tested, and then stirred in the contents of the watch glass; from time to time the experimenter should blow slowly on the agitated liquid; if the liquid thus stirred contains traces of nitric acid, circular lines of a deep red are soon visible, coloring the whole liquid to a pink. On adding a very small quantity of nitric acid to the mixture, the liquid becomes of a carmine color; the addition of a single drop of very dilute nitric acid renders the liquid a deep red, and afterwards a dead red. 3862. To Remove Nitric Acid from Sulphuric Acid. Diluted sulphuric acid may be deprived of any small quantity of nitric acid it may contain, by shaking it up. for a few minutes with a little powdered (freshly burned) charcoal, and afterwards filtering it. This will not answer for concentrated sulphuric acid; nitric acid is separated from it with great difficulty, and only by very protracted methods.