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Methyl Orange 0.1% Aqueous Solution
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Description
Methyl Orange 0.1% Aqueous Solution
Other Names: Acid Orange 52 solution, C.I. 13025 solution
CAS Number (Methyl Orange): 547-58-0
Sum Formula (dye): C₁₄H₁₄N₃NaO₃S
Appearance: Orange to reddish-orange liquid
Methyl Orange 0.1% is an aqueous solution of the synthetic azo dye methyl orange, widely used as a pH indicator and colorimetric reagent in laboratory and industrial applications. It exhibits a clear color transition from red (pH < 3.1) to yellow (pH > 4.4).
Chemical and Physical Properties
Concentration: 0.1% (w/v) in water
Solubility: Fully miscible with water
Color Transition Range: pH 3.1 (red) to pH 4.4 (yellow)
Stability: Stable under standard storage conditions
Odor: Odorless
Applications
Used as a pH indicator in titrations and analytical chemistry
Applied as a laboratory reagent for acid-base determination
Utilized in testing and visualization processes requiring distinct color changes
Safety
Signal Word: Danger
Hazard Statements
H301 Toxic if swallowed.
Precautionary Statements
P264 Wash skin thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P301 + P310 IF SWALLOWED: Immediately call a POISON CENTER/ doctor.
P405 Store locked up.
P501 Dispose of contents/ container to an approved waste disposal plant.
First Aid Measures
Eye Contact: Rinse with plenty of water for at least 10–15 minutes. Seek medical attention if irritation persists
Skin Contact: Wash thoroughly with soap and water
Inhalation: Move to fresh air
Ingestion: Rinse mouth with water. Seek medical advice if discomfort occurs
Handling and Storage
Store in tightly closed containers, in a cool, dry, and dark place
Protect from direct sunlight and strong oxidizing agents
Use proper PPE when handling to avoid staining and irritation