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|Section2= |Section7= }} Barium chlorate, Ba(ClO3)2, is a white crystalline solid, the barium salt of chloric acid. It is an irritant and toxic, as are all soluble barium compounds. It is sometimes used in pyrotechnics to produce a green color. It also finds use in the production of chloric acid. ==Reactions== Synthesis Barium chlorate can be produced through a double replacement reaction between solutions of barium chloride and sodium chlorate: :BaCl2 + 2 NaClO3 → Ba(ClO3)2 + 2 NaCl On concentrating and chilling the resulting mixture, barium chlorate precipitates. This is perhaps the most common preparation, exploiting the lower solubility of barium chlorate compared to sodium chlorate. The above method does result in some sodium contamination, which is undesirable for pyrotechnic purposes, where the strong yellow of sodium can easily overpower the green of barium. Sodium-free barium chlorate can be produced directly through electrolysis: :BaCl2 + 6 H2O → Ba(ClO3)2 + 6 H2 It can also be produced by the reaction of barium carbonate with boiling ammonium chlorate solution: :2 NH4ClO3 + BaCO3 + ''Q'' → Ba(ClO3)2 + 2 NH3 + H2O + CO2 The reaction initially produces barium chlorate and ammonium carbonate; boiling the solution decomposes the ammonium carbonate and drives off the resulting ammonia and carbon dioxide, leaving only barium chlorate in solution. Decomposition When exposed to heat, barium chlorate alone will decompose to barium chloride and oxygen: :Ba(ClO3)2 → BaCl2 + 3O2 Chloric acid Barium chlorate is used to produce chloric acid, the formal precursor to all chlorate salts, through its reaction with dilute sulfuric acid, which results in a solution of chloric acid and insoluble barium sulfate precipitate: :Ba(ClO3)2 + H2SO4 → 2HClO3 + BaSO4 Both the chlorate and the acid should be prepared as dilute solutions before mixing, such that the chloric acid produced is dilute, as concentrated solutions of chloric acid (above 30%) are unstable and prone to decompose, sometimes explosively. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Barium chlorate」の詳細全文を読む スポンサード リンク
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