Overview
Methyl Orange AR Grade is a high-purity chemical compound classified as an analytical reagent (AR), indicating its suitability for precise laboratory applications. As a pH indicator, it transitions from red (pH <3.1) to orange-yellow (pH >4.4), making it valuable for acid-base titrations. The AR designation signifies the material meets strict purity standards (typically ≥99%) with controlled limits for impurities that could interfere with analytical results. This grade is manufactured with tighter specifications than technical or laboratory grades.
Physical and Chemical Properties
The compound appears as an orange crystalline powder with good water solubility. Its azo group (-N=N-) structure is responsible for both its vivid color and pH-sensitive properties. The sodium sulfonate group enhances water solubility. Methyl Orange demonstrates stability under normal laboratory conditions but may degrade when exposed to strong acids, bases, or prolonged UV light. Its molecular weight of 327.33 g/mol and decomposition point near 300°C reflect its moderate thermal stability.
Main Applications
In analytical chemistry, Methyl Orange AR serves as a visual endpoint indicator for titrations, particularly for strong acid-strong base reactions (pH range 3.1-4.4). It's commonly used in educational laboratories and water quality testing. The dye also finds application in textile manufacturing as Acid Orange 52, though industrial grades are typically used for this purpose. In microbiology, it may be incorporated into selective media for bacterial identification.
Safety and Storage
While not highly toxic, Methyl Orange AR requires standard laboratory precautions. Use in well-ventilated areas with gloves and eye protection. Powder may cause mild irritation upon contact with skin or mucous membranes. For long-term storage, keep containers tightly sealed with desiccants in cool (15-25°C), dark conditions. Shelf life typically exceeds 3 years when stored properly. Avoid contamination from strong acids or bases which may degrade the indicator properties.
B2B Procurement Guide
When sourcing Methyl Orange AR Grade, verify the supplier's analytical certificate includes: CAS verification, purity percentage (≥99%), heavy metal content, and loss on drying specifications. Reputable suppliers should provide batch-specific COA documentation. Consider packaging options (25g, 100g, 500g) based on usage volume. For international shipments, confirm compliance with chemical transport regulations. Technical support for analytical applications may be a value-added service from specialty chemical distributors.
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