Eriochrome Black A
AR
Reagent
Code: #98676
CAS Number
3618-58-4
science Other reagents with same CAS 3618-58-4
blur_circular Chemical Specifications
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Molecular Information
Weight
461.38 g/mol
Formula
C₂₀H₁₂N₃NaO₇S
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Registry Numbers
MDL Number
MFCD00054390
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Storage & Handling
Storage
room temperature
description Product Description
Eriochrome Black A is widely used as a metallochromic indicator in complexometric titrations, particularly for determining the concentration of metal ions such as calcium, magnesium, and other divalent cations. It forms distinct color changes when it binds to these metal ions, making it valuable in water hardness testing and analytical chemistry. Additionally, it is employed in dyeing processes for textiles, where it acts as a mordant dye to enhance color fastness on fabrics. Its ability to chelate metal ions also makes it useful in certain industrial applications, including metal ion detection and separation processes.
format_list_bulleted Product Specification
| Test Parameter | Specification |
|---|---|
| Appearance | Deep yellow-red to black crystal powder solid |
| Lambda Max | 518.0-522.0 nm (0.1% Hydroxylamine HCl in MeOH) |
| Absorbance E1 1cm | >=175 (Hydroxylamine HCl (1%) MeOH sol 518.0-522.0 nm) |
| Drying Loss | 0-2 |
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