Methyl Orange Indicator, Pure
Catalog No: ASD-633
CAS No: 547-58-0
Color Index: C.I. 13025 (Acid Orange 52)
Grade: Laboratory Reagent / Indicator Grade
Product Overview
Methyl Orange (ASD-633) is a premium-quality azo dye used extensively as a pH indicator in analytical chemistry. This specific batch features an exceptionally high dye content of 97.3%, surpassing standard market specifications.
Known for its distinct color transition in acidic environments, Methyl Orange is the standard choice for titrations involving strong acids and weak bases. It transitions sharply from Pink (at pH 3.1) to Orange-Yellow (at pH 4.4), ensuring precise endpoint detection for laboratory professionals.
Key Features & Benefits
- High Purity: Verified spectrophotometric assay of 97.3%, ensuring potent and reliable indicator solutions.
- Sharp Transition: Confirmed transition range of pH 3.1 to 4.4, passing strict visual tests.
- Excellent Solubility: Dissolves completely to form a clear orange solution at 0.1% concentration.
- Low Moisture: Loss on drying is well below limits (1.39%), ensuring a stable, free-flowing powder with long shelf life.
Applications
🧪 Analytical Chemistry
- Acid-Base Titrations: The preferred indicator for titrating strong mineral acids (like HCl) against weak bases (like Sodium Carbonate).
- Water Analysis: Essential for determining alkalinity in water samples.
🔬 Education & Research
- Lab Standard: A staple reagent for university and industrial laboratories requiring reliable pH indication in the acidic range.
Certificate of Analysis (CoA)
Batch Specific Analysis Report
| Sr. No. | Criteria | Specification / Limit | Batch Result | Status |
|---|---|---|---|---|
| 1 | Appearance | Orange to yellow powder | Dark Orange Powder | ✅ Pass |
| 2 | Solubility (0.1% in dist. water) | Clear solution | Orange Solution | ✅ Pass |
| 3 | Transition Range | pH 3.1 (Pink) – pH 4.4 (Orange Yellow) | Passes Test | ✅ Pass |
| 4a | Absorptivity (A 1%/1cm) at pH 3.1 (λ max 504.2 nm) | 1050 - 1150 | 1115 | ✅ Pass |
| 4b | Absorptivity (A 1%/1cm) at pH 4.4 (λ max 468.6 nm) | 750 - 850 | 813 | ✅ Pass |
| 5 | Dye Content (By Spectrophotometry) | > 95.0% | 97.3% | ✅ Pass |
| 6 | Loss on Drying (at 110°C for 1hr) | < 3.0% | 1.39% | ✅ Pass |
Conclusion: The sample submitted for analysis COMPLIES with the specifications of the standard.
Safety & Handling
- Hazard: Toxic if swallowed.
- Storage: Store in a tightly closed container in a cool, dry place.
- Safety: Wear protective gloves and safety goggles. Avoid breathing dust.
