Eriochrome Red B
dye content 85%
Reagent
Code: #111696
Alias
Ella chrome red B; Acid chrome red B, Ella chrome red B, acid chrome red B, media red 7, 4-[(4,5-dihydro-3-methyl-5-oxo-1-benzene Base-1H-pyrazol-4-yl)azo]-3-hydroxy-1-naphthalenesulfonic acid monosodium salt, acidic medium bay red BN
CAS Number
3618-63-1
science Other reagents with same CAS 3618-63-1
blur_circular Chemical Specifications
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Molecular Information
Weight
446.41 g/mol
Formula
C₂₀H₁₅N₄NaO₅S
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Registry Numbers
MDL Number
MFCD00004080
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Storage & Handling
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description Product Description
Eriochrome Red B is primarily used as a metallochromic indicator in analytical chemistry, particularly in complexometric titrations. It is commonly employed to determine the endpoint in the titration of metal ions, such as calcium and magnesium, with ethylenediaminetetraacetic acid (EDTA). The indicator changes color from red to blue when it binds to metal ions, providing a clear visual signal for the completion of the reaction. This makes it a valuable tool in water hardness testing and other applications where precise measurement of metal ion concentrations is required. Additionally, it is used in dyeing processes for textiles, where it imparts specific colors to fabrics based on its interaction with metal ions.
format_list_bulleted Product Specification
| Test Parameter | Specification |
|---|---|
| Absorbance (E1%1cm) | 300 |
| Drying Loss | 0-5 |
| Dye Content | 85-100 |
| Lambda Max (MeOH) | 458.0-466.0 |
| Appearance | Red Powder |
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