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Specifications of Methyl Orange丨CAS 547-58-0
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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 |
Transport Information of Methyl Orange丨CAS 547-58-0
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Parameter |
Specification |
|
UN Number |
3143 |
|
Class |
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Packing Group |
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|
H.S. Code |
2927000090 |
|
Stability & Reactivity |
The product is chemically stable under standard ambient conditions (room temperature). |
|
Storage |
Tightly closed. Dry. Keep in a well-ventilated place. Keep locked up or in an area accessible only to qualified or authorized persons. |
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Condition to Avoid |
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Package |
Methyl Orange丨CAS 547-58-0 is a well-known azo dye and pH indicator commonly used in analytical chemistry. It changes color based on the acidity or basicity of a solution, making it especially valuable in titration procedures involving strong acids and bases. Due to its distinct and predictable color change, Methyl Orange is also used in educational, laboratory, and industrial applications.
Key Applications of Methyl Orange丨CAS 547-58-0
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:
o Academic chemistry labs
o Quality control in chemical manufacturing
o 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 of Methyl Orange丨CAS 547-58-0
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.
