Banum hydroxide

Dihydroxydimethylphosphinic acid, (CH20H)2P0(0H), is isolated in the form of its barium salt when the foregoing phosphonium chloride is boiled with aqueous banum hydroxide solution until evolution of hydrogen ceases. The salt forms well-developed crystals, moderately soluble in water, insoluble in alcohol. 

Banum oxide. [CAS 1304-28-5]. BaO. white solid, mp about 1900°C. reactive with H20 to forni barium hydroxide. Barium peroxide, Ba02-8H20, white precipitate, formed by reaction of barium salt solution and hydrogen or sodium peroxide, yields anhydrous banum peroxide upon heating at 100°C in a current of dry air. Anhydrous barium peroxide is also fonned by heating barium oxide in air or oxygen under pressure (at somewhat over one atmosphere pressure) and temperature of 400°C. 

Barium sulfide. [CAS 21109-95-5]. BaS. grayish-white solid, fonned by heating barinm sulfate and carbon, reactive with II20 to fonn barium hydrosulfide, Ba(SH)2, solution. The latter is also made by saturation of barium hydroxide solution with H S. Banum polysulfides are formed by boiling barium hydrosulfide witli sulfur. 

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