Methyl Red Extra Pure

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Methyl Red Extra Pure is a high-grade pH indicator commonly used in analytical chemistry, especially in titration processes to identify the endpoint between acidic and basic solutions. It exhibits a clear color change from red in acidic environments (pH below 4.4) to yellow in alkaline conditions (pH above 6.2), making it ideal for monitoring pH transitions in laboratory procedures. Beyond titrations, it is also used in microbiological media to distinguish between types of bacterial metabolism. This extra pure quality ensures excellent sensitivity, precision, and reliability in both educational and professional scientific settings.

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Categories: Analytical Reagents, LABORATORY CHEMICALS Tags: AcidBaseIndicator, AnalyticalReagent, ChemicalIndicator, ExtraPure, LaboratoryChemicals, labreagents, MethylRed, PHIndicator, SpecialtyChemicals, TitrationIndicator

Description

Methyl Red Extra Pure

Primary Uses:

pH Indicator – Commonly used in titrations, especially for identifying the endpoint between pH 4.4 (red) and pH 6.2 (yellow).
Acid-Base Indicator in Microbiology – Essential component of the Methyl Red Test (MR-VP test) for detecting mixed acid fermentation in bacterial identification.

Secondary Uses:

Educational Demonstrations – Used in school and university labs to visually teach acid-base chemistry and indicator behavior.
Analytical Chemistry – Applied in quality control and analysis protocols requiring precise pH monitoring.

PRODUCT KEY FEATURES

1. Basic Identification Attributes

Chemical Name: Methyl Red
IUPAC Name: 2-(N,N-Dimethyl-4-aminophenyl)azobenzene-4-carboxylic acid
CAS Number: 493-52-7
Molecular Formula: C₁₅H₁₅N₃O₂
Molecular Weight: 269.30 g/mol
Appearance: Dark red to purple crystalline powder
Odor: Odorless
Solubility: Slightly soluble in water; soluble in alcohol and acetone
Grade: Extra Pure
pH Range (Indicator): pH 4.4 (red) to 6.2 (yellow)
Melting Point: ~179–181 °C

2. Safety & Hazard Attributes

GHS Classification:
- Skin Irritant (Category 2)
- Eye Irritant (Category 2)
- Harmful if swallowed (Category 4)
Hazard Statements:
- H302: Harmful if swallowed
- H315: Causes skin irritation
- H319: Causes serious eye irritation
Precautionary Statements:
- P280: Wear protective gloves/protective clothing/eye protection
- P301+P312: IF SWALLOWED: Call a POISON CENTER or doctor if unwell
- P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes
Personal Protective Equipment (PPE):
- Lab coat
- Gloves
- Safety goggles or face shield
First Aid Measures:
- Inhalation: Move to fresh air
- Skin Contact: Wash with soap and water
- Eye Contact: Rinse immediately with plenty of water
- Ingestion: Rinse mouth; seek medical attention
Fire Hazards:
- Flammability: May be combustible
- Extinguishing Media: Dry chemical, CO₂, foam, or water spray

3. Storage & Handling Attributes

Storage Conditions:
- Store in tightly closed container
- Keep in a cool, dry place
- Protect from light and moisture
Handling Tips:
- Avoid contact with skin and eyes
- Use in well-ventilated area

4. Laboratory Applications

Primary Uses:
- pH indicator in titrations and buffer systems
- Acid–base titration (transitions from red to yellow)
Secondary Uses:
- Research in dye chemistry and azo compound synthesis
- Staining and microbiological applications

SAFETY HANDLING PRECAUTIONS

SAFETY PRECAUTIONS

Personal Protective Equipment (PPE):

Wear a lab coat, nitrile gloves, and chemical safety goggles.
Use a dust mask or work in a fume hood to prevent inhalation.

Handling:

Avoid contact with skin, eyes, and clothing.
Prevent the formation and inhalation of dust or powder.
Handle with adequate ventilation.
Wash hands thoroughly after use.

Storage:

Store in a cool, dry, and well-ventilated place.
Keep the container tightly closed and away from light and heat.
Avoid contact with oxidizing agents.

FIRST AID MEASURES

Inhalation:

Move people to fresh air.
If breathing is difficult, seek medical attention.

Skin Contact:

Wash thoroughly with soap and water.
Remove contaminated clothing.
Get medical advice if irritation persists.

Eye Contact:

Rinse cautiously with plenty of water for several minutes.
Remove contact lenses if easy to do.
Continue rinsing and seek medical help if needed.

Ingestion:

Rinse mouth with water.
Do not induce vomiting.
Seek medical attention immediately if symptoms occur.

FIRE FIGHTING MEASURES

Flammability:

May be combustible in fine powdered form.

Extinguishing Media:

Use dry chemicals, carbon dioxide (CO₂), foam, or water spray.

Hazardous Combustion Products:

Can emit carbon oxides and nitrogen oxides when burned.

Firefighter Protection:

Wear self-contained breathing apparatus (SCBA) and full protective gear.