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Eriochrome Extra Pure
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SHORT DESCRIPTION
Eriochrome Extra Pure—typically referring to Eriochrome Black T—is a complexometric indicator primarily used in EDTA titrations to detect metal ions, especially calcium (Ca²⁺) and magnesium (Mg²⁺) in water hardness analysis. In its extra pure grade, this dye ensures sharp, precise endpoint detection by minimizing impurities that could cause background coloration or interferences in spectrophotometric or volumetric determinations. It functions by forming a wine-red complex with metal ions, which turns blue when the metal is sequestered by EDTA. Suitable for high-precision analytical chemistry, it should be stored away from light and moisture to preserve stability.
Description
USES
Primary Laboratory Uses:
- Complexometric indicator in EDTA titrations:
Used mainly for determining water hardness by detecting calcium and magnesium ions through color change. - Metal ion detection in solution:
Forms colored complexes with metal ions, aiding in qualitative and quantitative analysis. - pH-sensitive indicator in metal-ligand equilibria studies:
Its color shift helps determine end points in chelation reactions.
Secondary Laboratory Uses:
- Teaching and demonstration of coordination chemistry:
Commonly used in academic labs to illustrate complexation and titration techniques. - Indicator in soil and environmental testing:
Helps estimate divalent metal ion content in environmental water or soil extracts.
Analytical quality control in industrial water treatment labs:
Used to ensure appropriate levels of calcium and magnesium in treated water.
KEY PRODUCT FEATURES
KEY ATTRIBUTES
1. Basic Identification Attributes
- Chemical Name: Eriochrome Black T
- Other Names: Solochrome Black T, Mordant Black 11
- Chemical Formula: C20H12N3NaO7S
- CAS Number: 1787-61-7
- Grade: Extra Pure (Laboratory Grade)
- Appearance: Dark violet to black powder
2. Physical & Chemical Properties
- Molecular Weight: 461.38 g/mol
- Solubility: Soluble in water and alcohol
- pH Range for Use: Effective as an indicator in pH 6–8
- Color Change:
- Free Indicator: Blue
- Complexed with metal ions (e.g., Mg²⁺): Red
3. Safety & Hazard Attributes
- GHS Classification: Not classified as hazardous
- Hazard Statements:
- May cause mild skin or eye irritation
- Dust may cause respiratory irritation
- PPE Requirements:
- Protective gloves
- Safety goggles
- Dust mask or respirator in powder form
- Lab coat
- First Aid Measures:
- Inhalation: Move to fresh air
- Skin Contact: Rinse with water
- Eye Contact: Flush eyes with water for 15 minutes
- Ingestion: Rinse mouth, seek medical advice if symptoms persist
4. Storage & Handling Attributes
- Storage Conditions:
- Keep container tightly closed
- Store in a cool, dry, and well-ventilated area
- Protect from light and moisture
- Handling Notes:
- Avoid dust generation
- Use in well-ventilated conditions
5. Regulatory & Compliance Attributes
- EC Number: 217-250-3
- UN Number: Not applicable
- Hazard Class: Non-hazardous for transport
- REACH Status: Registered
6. Laboratory Applications
- Primary Uses:
- Complexometric titrations, especially for determination of calcium and magnesium in water hardness tests (used with EDTA)
- Indicator in chelometric analysis
- Other Uses:
- Educational chemistry kits and demonstrations
- Analytical control in water treatment labs
SAFETY HANDLING PRECAUTIONS
SAFETY MEASURES
SAFETY & HANDLING
- PPE: Gloves, goggles, and lab coat
- Storage:
- Store in a cool, dry place
- Keep container tightly sealed
- Stability: Stable when kept dry and away from strong oxidizers
FIRST AID MEASURES
- Inhalation: Move to fresh air, seek medical attention if irritation occurs
- Skin Contact: Wash thoroughly with water and soap
- Eye Contact: Rinse immediately with water for several minutes
- Ingestion: Rinse mouth; do not induce vomiting—seek medical help
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