4230. Nitrate of Baryta

4230.    Nitrate of Baryta. It is prepared in the same manner as muriate of baryta (see No. 4234 (Chloride of Barium)), substituting pure nitric acid for the muriatic acid.

4231. Sulphate of Baryta

4231.      Sulphate of Baryta. This occurs as a native mineral, and is white, if pure. It occasionally contains iron, which may bo removed by washing first with dilute sulphuric acid, and afterwards with pure water. (See No. 2097 (White Fire for Pans or Stars).)

4232. Acetate of Baryta

4232.     Acetate of Baryta. Dilute acetic acid neutralized with carbonate of baryta, and evaporated to form crystals.

4233. Carbonate of Baryta

4233.    Carbonate of Baryta. A heavy white powder found in the crude state abundantly in nature, and sufficiently pure for general purposes. The pure carbonate may be precipitated from a solution of chloride of barium by the addition of any pure alkaline carbonate, washing and drying the product. (Cooley.)

4234. Chloride of Barium

4234.     Chloride of Barium. Also called Muriate of Baryta. Mix gradually 10 ounces carbonate of baryta in small pieces, with 1/2 pint muriatic acid diluted with 1 quart distilled water; evaporate to a pellicle or crust (see No. 9 (Crystallization)), and set aside to crystallize.

4235. Protoxide of Barium

4235.    Protoxide of Barium. This is the oxide of barium or baryta. (See No. 3985 (Baryta).)

4236. Peroxide of Barium

4236.    Peroxide of Barium. The peroxide or binoxide is prepared from pure baryta, heated to a full red heat in a porcelain tube, and exposed to a stream of pure dry oxygen gas. Instead of baryta, its nitrate may be used, but the nitrous fumes must be allowed to pass off entirely before applying the oxygen.

4237. Sulphuret of Barium

4237.    Sulphuret of Barium. Calcine and reduce to powder 2 pounds sulphate of baryta, mix it with 4 ounces finely powdered charcoal; submit the mixture for 3 hours to a low white heat in a covered crucible. When cool, powder, and boil for 5 minutes in 5 pints water; decant the clear, and repeat the operation with 3 pints more water; unite the liquors, and crystallize by cooling.

4238. Carbonate of Lithia

4238.    Carbonate of Lithia. Precipitate a solution of sulphate of lithia, by a strong solution of sesquicarbonate of ammonia; collect the precipitate, drain and press it, wash it with a little rectified spirit, and dry it. Dissolve in boiling water, and crystallize by slow evaporation.

4239. Sulphate of Lithia

4239.      Sulphate of Lithia. Finely powdered petalite, 1 part; fluorspar, 2 parts; mix, add oil of vitriol, 10 parts, and heat the mixture as long as acid vapors are evolved. The residuum must bo dissolved in pure water of ammonia, boiled, filtered, the solution evaporated to dryness, and tho dry mass heated to redness. The matter left is pure sulphate of lithia. (Berzelius.)

Petalite or Spondumene is a mineral found in various parts of Europe, also in Massachusetts and Connecticut. (Booth.)