Methyl orange

Methyl Orange

Methyl orange is a pH indicator frequently used in titration because of its clear and distinct color variance at different pH values. Methyl orange shows red color in acidic medium and yellow color in alkaline medium.

Chemical Structure

Methyl orange is a compound made from sulfonated aniline, and its chemical structure includes a benzene ring, a naphthalene ring, and three sulfonic acid groups. Its chemical formula is C14H14N3NaO3S.

Preparation

Methyl orange is prepared from sulfanilic acid and dimethylaniline in acidic medium. The reaction involves a process known as diazo coupling reaction.

Uses

Methyl orange is primarily used as a pH indicator in various laboratory applications. It is also used in the dyeing process for textiles, and in the preparation of litmus paper.

Safety and Precautions

Methyl orange is considered a hazardous substance, and proper safety precautions should be taken when handling it. It can cause irritation to the skin and eyes, and may be harmful if swallowed or inhaled.

See Also

• pH indicator
• Titration
• Sulfanilic acid
• Dimethylaniline
• Diazo coupling reaction
• Litmus paper

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