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08048036175
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Laboratory Chemicals by MNC CHEMICALS SURGICALS

Eriochrome Black T indicator

Phone Number

08048036175

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Email Address mnc.naveen@gmail.com

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Address Correspondence Address: Shop No. 20, 2nd Floor, Srirama Tower, Bogulkunta, Telangana

Hyderabad, India, 500001

Description

Eriochrome Black T is a dark purple-brown or black azo dye commonly used as a complexometric indicator in analytical chemistry, especially to determine water hardness via EDTA titration.​ Chemical Properties Molecular formula: C₆₀H₁₂N₃O₇SNa Molar mass: 461.38 g/mol Appears as a dark red-brown or black powder; odorless.​ Soluble in water (5 g/100 ml at 20°C) but nearly insoluble in most organic solvents including ethanol.​ pKa values: ~6.2 and 11.55 (for acid dissociation).​ Indicator Function In EDTA titration, Eriochrome Black T binds metal ions such as Ca²⁺ and Mg²⁺, turning red when complexed. When all metal ions are chelated by EDTA, the indicator reverts to its unbound blue form, marking the titration endpoint.​ It’s also used to detect rare earth metals and can serve in test paper preparation for calcium detection.​ Safety and Storage Irritant but not considered highly toxic or carcinogenic; ingestion may cause diarrhea.​ Store in closed amber bottles, away from light and corrosive vapors to preserve stability.​ Eriochrome Black T is fundamental in water quality assessment and general complexometric analysis due to its distinct color change and reliable sensitivity to metal ions.

Model No. N-CH1756

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