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Barium chloride is an inorganic compound with the formula Ba Cl 2. It is one of the most common water-soluble salts of barium . Like most other water-soluble barium salts, it is a white powder, highly toxic, and imparts a yellow-green coloration to a flame.
Barium, typically as barium nitrate imparts a yellow or "apple" green color to fireworks; [30] for brilliant green barium chloride is used. Barium peroxide is a catalyst in the aluminothermic reaction for welding rail tracks. It is also a green flare in tracer ammunition and a bleaching agent. [31]
Barium chloride – BaCl 2 [87] Barium chromate – BaCrO 4 [88] Barium ferrate – BaFeO 4; Barium ferrite – BaFe 12 O 19 [89] Barium fluoride – BaF 2 [90]
Barium is used in vacuum tubes as a getter to remove gases. [61] Barium sulfate has many uses in the petroleum industry, [4] [80] and other industries. [4] [61] [81] Radium has many former applications based on its radioactivity, but its use is no longer common because of the adverse health effects and long half-life.
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Reactions of barium hydroxide with ammonium salts are strongly endothermic. The reaction of barium hydroxide octahydrate with ammonium chloride [18] [19] or [20] ammonium thiocyanate [20] [21] is often used as a classroom chemistry demonstration, producing temperatures cold enough to freeze water and enough water to dissolve the resulting mixture.
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