臭素酸カリウム

解説KBrO3(167.00)．水酸化カリウムと臭素とを水溶液中で反応させて次亜臭素酸カリウムKBrOをつくり，さらにこの液を煮沸してKBrO3にかえた後に，冷却して結晶を析出させる．白色の三方晶系のイオン結晶(または粉末)．三方すい型のBrO3－を含む．Br-O1.64 Å．∠O-Br-O106°．密度3.27 g cm－3．臭素酸カリウムは，強熱すると，370 ℃ 以上で O2 を発生して分解する．2KBrO3 → 2KBr ＋ 3O2強い酸化剤．固体に炭素や硫黄などの酸化されやすい物質をまぜたものは加熱すると爆発する．小麦粉の漂白・改質剤，分析試薬(臭素化滴定用や，酸化還元滴定の標準物質)などに用いられる．有毒．森北出版「化学辞典（第2版）

用途酸化還元滴定。

用途食品添加物(小麦粉品質改良剤,魚肉製品添加剤),分析試薬

使用Potassium Bromate is a dough conditioner that exists as white crystals or powder and is soluble in water. it exists in the anhydrous form as white granular powder and in the hydrated form as small white crystals or granules. it is used to age and improve the baking properties of flour. it is used with potassium iodate and azodicarbon- amide to modify the protein in bread flour to promote the desired properties of loaf volume and shape. it is used in baked goods.

一般的な説明A white crystalline solid.

純化方法Crystallise KBrO3 from distilled H2O (2mL/g) between 100o and 0o. To remove bromide contamination, a 5% solution in distilled H2O, cooled to 10o, is bubbled with gaseous chlorine for 2hours, then filtered and extracted with reagent grade CCl4 until colourless and odourless. After evaporating the aqueous phase to about half its volume, it is cooled again slowly to about 10o. The crystalline KBrO3 that separates, is washed with 95% EtOH and dried in a vacuum [Boyd et al. J Am Chem Soc 74 237 1952]. Another way to remove Br-ions is by stirring several times in MeOH and then drying at 150o [Field & Boyd J Phys Chem 89 3767 1985].