Contractions. - Sulph. Ac. Su.-x.

Present name. - Sulphuric Acid. H1So4.

Sulphuric Acid. For. name: German, Schwefelsaure.

Hahnemann recommends the Nordhausen or fuming Sulphuric Acid to be used, directing it to be re-distilled in glass vessels. A very pure acid, however, can be obtained from some of the manufacturing chemists.

Characters and Tests. - Strong Sulphuric Acid is a colourless oily liquid, sp. gr. 1.843, evolving much heat on the addition of water, and when diluted gives a copious white precipitate with Chloride of Barium, insoluble in Nitric Acid. Evaporated in a platinum crucible, it leaves no residue. Diluted with six times its volume of distilled water, no white precipitate appears. Neither does it give any precipitate with Sulphuretted Hydrogen. When a solution of Sulphate of Iron is poured gently on its surface, no purple colour is developed where the two liquids unite.

Preparation. - The officinal acid of the British Pharmacopoeia contains 96'8 per cent. of the pure acid. Hence, 30 minims mixed gradually with sufficient distilled water to measure when cold 9 fluid drachms, will constitute our lx preparation. The 1 dilution should be made with distilled water, 3X to 3 with distilled water to which 5 per cent. of rectified spirit has been added, 4 with dilute alcohol, and 5 and following dilutions with rectified spirit.

Reference to Horn. Proving. - Chr. Kr., vol. v.

Proper forms for dispensing. - Below 4, watery Solution only. 4, dilute Tincture. 5 and upwards, Tincture, Pilules, or Globules.