Source	:	Mineral Kingdom
Formula	:	AS2O3
Synonym	:	English, Arsenious acid; French, acide arsenieux Arsenic blanc; German, Arseige Saure
Description	:	A white or transparent amorphous lumps or crystalline powder, odourless, stable in air. Poison! It is slowly soluble in water. The amorphous variety being more soluble than the crystalline variety.It is sparingly soluble in alcohol. It’s completely soluble in glycerin.It may be obtained by roasting certain arsenical ores. Arsenic trioxide, dried at 105 degree for two hours contains not less than 99.8 percent of AS2O3.
Identification	:	(i) Sublimes on heating, with the formation of transparent octahedral crystals. (ii) A small quantity warmed with about 5ml of hydrochloric acid, gives a brown colored or white precipitate on addition of few drops of Solution of stannous chloride. (iii) An acidified solution gives a yellow precipitate with hydrogen Sulphide.
Non-Volatile matter	:	Leaves not more than 0.1 percent of the residue.
Assay	:	Dissolve about 0.1g accurately weighed in about 20ml of boiling water and 5 ml of 0.1N sodium hydroxide cool; add 5ml of 1 hydrochloric acid followed, by about 3 g of sodium bicarbonate, and triturate the mixture with 0.1 N iodine using starch as indicator. Each ml of 0.1 N iodine is equivalent to 0.004946 g of AS2O3.
History & Authority	:	Allen’s Encyclopedia,Mat.Med.Vol 1 496.
Preparation:		(a) Solution                                             Drug Strength (1/100)        Arsenicum Album in fine powder                      10g        Glycerin                                                        100ml        Strong Alcohol                                               100ml      Purified water in sufficient quantity To make one thousand milliliters of mother solution.      Heat fine powder of Arsenicum Album with glycerin at 100 degree until a clear solution is obtained. Cool this solution and add it to 750 ml of purified water and 100ml of strong alcohol. Mix well. Bring the volume to one thousand milliliters by adding purified water if found necessary. (b) Potency: 3x and higher with dispensing alcohol. (c) Trituration 1 c Drug Strength 1/100 Arsenicum Album in fine powder 10g Saccharum Lactis 990g To make one thousand grams of the trituration. (d) Potency: 3x and higher to be triturated, 6x may be converted to liquid 8x, 9x and higher with dispensing alcohol..
Caution	:	Not to be prescribed below 3x.