CAS · 547-58-0
Product Overview
Methyl Orange is a high-purity dyes-pigments supplied for industrial and specialty chemical applications. Contact our team for specifications, packaging options and lead times.
Product Specifications
| Property | Specification |
|---|---|
| Grade | IND |
| Appearance | Orange yellow powder or flaky crystal |
| Water Dissolution Test | Conforms |
| PH | 3.0 (red) to 4.4 (yellow) |
| Residue on Ignition (SO₄) w/% | 18.5% to 22.0% |
| Sensitivity Test | Conforms |
| Oxide | Conforms |
Applications
1. Acid-Base Titrations
● Primary use in laboratories as a pH indicator for strong acid–weak base titrations.
● Exhibits a sharp and distinct color change from red (acidic) to yellow (basic).
● Commonly used in:
Academic chemistry labs
Quality control in chemical manufacturing
Water analysis
2. Textile Industry
● Occasionally used as a dyeing agent for wool, silk, and other protein fibers under acidic conditions.
● Provides vivid, water-soluble orange-red hues, though limited by poor lightfastness.
3. Educational Demonstrations
● Used in chemistry demonstrations to teach acid-base concepts, titration principles, and pH theory.
● Its visible color transition helps students visualize chemical changes in real-time.
4. Biochemical and Microbiological Applications
● Occasionally used in staining techniques for identifying microorganisms or pH changes in growth media.
● Assists in indicating metabolic activity in certain bacteria cultures by signaling acidic byproducts.
5. Environmental and Water Testing
● Used as a tracer dye and indicator in assessing water pH and acidic pollution levels.
● Helps in monitoring wastewater treatment, acid mine drainage, and industrial effluent management.
Benefits
1. Clear and Rapid Color Transition
● Provides a sharp pH transition range (3.1 to 4.4), making it ideal for precise titration end-point detection.
● Color change from red (pH < 3.1) to orange/yellow (pH > 4.4) is easy to observe.
2. High Sensitivity to pH Changes
● Highly responsive to minor changes in acidity, ensuring accurate detection in low-pH environments.
3. Cost-Effective and Widely Available
● Economical choice for routine lab use and industrial processes.
● Long shelf life under appropriate storage conditions.
4. Water-Soluble and Easy to Use
● Easily dissolved in water or alcohol, with straightforward preparation for titration or staining use.
Conclusion
Methyl Orange丨CAS 547-58-0 is a highly reliable and widely used acid-base indicator essential in analytical chemistry, education, and environmental monitoring. Its vivid color change and affordability make it a staple in laboratories around the world. Though primarily known for its pH-indicating role, its secondary uses in dyeing and microbiology further highlight its versatility.
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