バリウムジブロミド 化学特性,用途語,生産方法
解説
臭化バリウム．バリウムの炭酸塩または水酸化物を臭化水素酸に溶かして濃縮すると二水和物が得られる．二水和物は無色の単斜晶系結晶．密度3.58 g cm－3．75 ℃ で一水和物となり，120 ℃ で無水物となる．いずれも水，エタノールに易溶．無水物は無色の斜方晶系粉末．密度4.78 g cm－3．融点847 ℃．それ以上に熱すると分解する．臭化物の製造原料，写真用剤，りん光材料などに用いられる．有毒．
説明
Barium bromide has the molecular formula of BaBr2.
Like barium chloride, it is soluble in water but is toxic if
ingested. BaBr2 crystallizes in a PbCl2 motif, as white
orthorhombic crystals that are deliquescent. In aqueous
solution, BaBr2 behaves as a simple salt.
Barium bromide can be crystallized from its solution
as a dihydrate, BaBr2·2H2O (molecular weight: 333.19),
which forms the anhydrate by heating to 120°C. It
dissolves in its own water-of-hydration at 75°C before
decomposing to the anhydrate.
化学的特性
White Crysatalline Powder
物理的性質
White orthorhombic crystal; density of anhydrous BaCl2 4.78 g/cm
3, and dihydrate BaCl2 ? 2H2O 3.58 g/cm
3; melts at 857°C; vaporizes at 1,835°C; readily dissolves in water (92.2 g/100 g water at 0°C).
使用
Barium bromide is
a precursor to chemicals used in photography as well
as to form other bromides.Historically, barium bromide was used to purify
radium in a process of fractional crystallization devised
by Marie Curie. Since radium precipitates preferentially
in a solution of barium bromide, the ratio of radium to
barium in the precipitate was found to be higher than
the ratio in the solution.
製造方法
Barium bromide can be prepared from barium
sulfide or barium carbonate by reaction with hydrobromic
acid to give hydrated barium bromide:
BaS＋HBr→BaBr2＋H2S
BaCO3＋HBr→BaBr2＋CO2＋H2O
危険性
Ingestion of the salt or its aqueous solution can produce severe poisoning.
バリウムジブロミド 上流と下流の製品情報
原材料
準備製品