ferric arsenate

Pharmacy: Fe3AsO3, Ferri arsenias. A green, amorphous, insoluble powder, obtained by precipitating a mixed solution of four parts of arseniate of sodium with three parts of sodium acetate, by a solution of nine parts ferrous sulphate. It has the same medicinal properties as arsenic. IMG:content-1560.png:[blocks in formation] IMG:content-1561.png:[blocks in formation] Chem. A name formerly given to Ferrocyanide. fěr-rō-çy-ăn-ic, a. [Pref. ferro-, and Eng. reaction, reddens litmus, and decomposes many metallic salts, yielding ferrocyanides. When an aqueous solution of ferrocyanic acid is heated, it gives off hydrocyanic acid, and deposits Pru ian blue. fěr-rō-çy-ăn-ide, s. [Pref. ferro-, and Eng. cyanide (q. v.).] Chem. A salt of hydro ferrocyanic acid, ferro- pru iate. The ferrocyanides of ammonium, so- dium, pota ium, barium, strontium, calcium, and magnesium are soluble. Cupric ferrocyanide is a reddish-brown powder; ferric ferrocyanide is blue, Pru ian blue; nickel and cobalt ferrocyanides are green; the ferrocyanides of silver, lead, zinc, and *fer-rom, *fer-rome, *fer-rum, α. manganese are white insoluble powders. By the action of oxidizing agents ferrocyanides are con- verted into ferricyanides; by the action of nitric acid into nitro-pru ides. When heated ferrocy- anides are decomposed into cyanide of iron and cyanide of the other metal, the cyanide of iron being further converted into iron and carbon, and nitrogen is given off; the other cyanide remains metal is reduce a and nitrogen given off. The pres ence of iron in ferrocyanides cannot be detected by the addition of caustic alkalies, nor by ammonium sulphide. The following are the chief ferrocya- nides: IMG:content-1562.png:[blocks in formation] "He saw the toun o ferrum lien."- Minot , p. 29. fer-rō-prŭs-si-āte, s . [Pref. ferro- , and Eng. pru iate (q. v.).] [FERROCYANIDE.] pru ic (q. v.).] [FERROCYANIDE.] IMG:content-1563.png:[blocks in formation] blue is prepared by adding exce of ferrocyanide in collodion, and after a time in the silver solution. of pota ium to ferric chloride. Pure Pru ian blue is called Paris blue; impure, containing alumina, is called mineral blue. Pru ian blue is often adulterated with alumina, chalk, gypsum, and starch. It is used as a pigment, and also to dye wool, cotton, and silk. ferrous ferrous carbonate, s. 1. Chem.: FeCO3. Pro to carbonate of iron. It occurs native as spatose iron ore, and in an impure state of clay ironstone in the carboniferous series. When heated in a closed ve el_3FeCO3=2CO2+CO and Fe3O4, black magnetic oxide of iron is formed. Hydrated ferrous carbonate is obtained as a whitish-green precipitate. When a solution of a ferrous salt is mixed with an alkaline carbonate, it absorbs oxygen from the air and loses carbonic acid, and is converted into hydrated ferric oxide. Ferrous carbonate occurs in chalybeate springs, being held in solution by the exce of carbonic acid present. 2. Pharm.: Carbonate of iron obtained by decomposing a solution of sulphate of iron by carbonate of ammonia, and rubbing the precipitate with sugar, and drying at 212° Fahr. It is called Ferri carbon as sac char at a. It is used in Mistura ferri compos it a and in Pilula ferri carbon at is . It is not astringent, and restores the blood.