メチルオレンジ 化学特性,用途語,生産方法
外観
赤黄色〜黄赤色, 澄明の液体
溶解性
水及びエタノールと任意の割合で混和する。
解説
メチルオレンジ，橙黄色の結晶．水に微溶．水100 g に対する溶解度は0.02 g(20 ℃)．水溶液は塩基性で黄色，酸性で赤色，変色域は pH 3.1～4.4．
森北出版「化学辞典（第2版）
用途
酸塩基中和滴定の指示薬（変色範囲pH 3.1 - 4.4)。
用途
メチルオレンジ（Methyl orange）は、滴定においてよく使われるpH指示薬である。メチルオレンジは酸性の半ばで非常にはっきりと色が変化するため、酸の滴定に良く使われる。万能指示薬と違い、色々な色に変化するわけではない。
用途
酸塩基中和滴定指示薬。
化学的特性
Orange-yellow powder. Soluble in hotwater; insoluble in alcohol.
使用
Methyl orange is a pH indicator frequently used in titrations, also used for histological microscopy.
製造方法
4-Aminobenzenesulfonic acid diazo, and N,N-dimethylaniline coupling.
定義
An acid–base indicator
that is red in solutions below a pH of 3 and
yellow above a pH of 4.4. As the transition
range is clearly on the acid side, methyl orange
is suitable for the titration of an acid
with a moderately weak base, such as
sodium carbonate.
一般的な説明
Orange powder.
空気と水の反応
Azo dyes can be explosive when suspended in air at specific concentrations. Insoluble in water.
反応プロフィール
Methyl Orange is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides.
純化方法
Recrystallise it twice from hot water, then wash it with a little EtOH followed by diethyl ether. It is an indicator: pH 3.1 (red) and pH 4.4 (yellow). [Beilstein 16 IV 510.]
メチルオレンジ 上流と下流の製品情報
原材料
準備製品