APEX LABS | LABORATORY CHEMICALS & INDICATORS
ERIOCHROME BLACK T (C.I. NO. 14645) 25 GMS – OXFORD LAB FINE CHEM
High-sensitivity complexometric indicator powder (Solochrome Black T) for EDTA titrations and water hardness determination.
Code: E-03680
25 Grams Pack
Oxford Lab Fine Chem
Product at a Glance
Eriochrome Black T (C.I. No. 14645 / Solochrome Black T) 25 gms manufactured by Oxford Lab Fine Chem LLP (Product Code: E-03680) is a premier complexometric indicator powder for EDTA titrations, metal ion determinations, and total water hardness testing. It delivers a distinct visual color change from wine-red to clear blue at the titration endpoint. Supplied by Apex Labs with complete GST tax invoices and Government e-Marketplace (GeM) portal support.
Note: Images for illustration purposes only. Actual bottle shape, cap color, or label design may vary based on manufacturer batches.
Product Overview: Eriochrome Black T Indicator Powder
Eriochrome Black T (also designated as Solochrome Black T, C.I. 14645) is a versatile azo dye indicator indispensable for complexometric titrations. Product Code E-03680 from Oxford Lab Fine Chem LLP is refined to ensure exceptional chelation sensitivity when detecting alkaline earth metal ions like Calcium ($\text{Ca}^{2+}$) and Magnesium ($\text{Mg}^{2+}$).
In buffered alkaline conditions (pH 10.0), it forms a wine-red complex with metal ions. Upon complete chelation by EDTA, the free indicator yields a brilliant blue endpoint, making it the universal standard for determining water hardness in environmental labs and industrial processing units.
Explore our comprehensive range of complexometric indicators, volumetric solutions, and fine chemicals in our laboratory chemicals catalog.
Key Specifications
COLOR INDEX NO.
C.I. 14645
PRODUCT CODE
E-03680
ENDPOINT SHIFT
Wine-Red to Blue
PACK WEIGHT
25 Grams
Technical Specifications
| Specification Parameter | Technical Benchmark |
|---|---|
| Chemical Product Name | Eriochrome Black T / Solochrome Black T |
| Manufacturer Product Code | E-03680 |
| CAS Registration Number | 1787-61-7 |
| Color Index Designation | C.I. 14645 (Mordant Black 11) |
| Color Transition Profile | Wine-Red (Metal-Bound Complex) to Clear Blue (Free Indicator at pH 10) |
| Packaging Size | 25 Grams Container |
| Physical Appearance | Dark brown / brownish-black crystalline powder |
| Solubility Profile | Soluble in Water and Alcohol; Soluble in Triethanolamine |
| Manufacturer | Oxford Lab Fine Chem LLP |
| Authorized Supplier | Apex Labs (Varanasi, UP, India) |
Key Product Features
Sharp Complexometric Endpoint
Provides a vivid, unmistakable shift from wine-red to true blue upon reaching complete EDTA chelation.
High Metallochromic Purity
Refined to eliminate trace metal contaminants on your Eriochrome Black T 25g, preventing baseline color distortion.
Versatile Solid & Solution Mixing
Easily ground with NaCl/KCl as a dry indicator powder mixture or dissolved in triethanolamine/alcohol working solutions.
Trusted Brand Manufacturer
Produced by Oxford Lab Fine Chem LLP under controlled quality standards for consistent analytical performance.
Primary Sector Applications
- Water Hardness Analysis: Standard indicator used in environmental testing for calculating total hardness ($\text{Ca}^{2+}$ and $\text{Mg}^{2+}$ concentration) via EDTA titration.
- Metallurgical & Mineral Testing: Determination of zinc, lead, manganese, and magnesium ions in industrial assays.
- Educational Chemistry Practicals: Essential reagent across school, college, and university laboratories for complexometric analysis.
- Pharmaceutical Quality Control: Testing raw materials, mineral supplements, and water purity in pharma processing facilities.
B2B • INSTITUTIONAL • BULK PROCUREMENT
Bulk Procurement & GeM Supply Lines
Apex Labs supplies genuine laboratory indicators and reagents from Oxford Lab Fine Chem LLP with full commercial GST tax invoices for seamless Input Tax Credit (ITC) reconciliation.
We support universities, CSIR institutes, testing laboratories, and industrial R&D units via direct bulk supply or official tender fulfillment on the Government e-Marketplace (GeM) portal.
Product Specification & Direct Ordering
E-03680 Eriochrome Black T 25g Oxford Lab Fine Chem: Complexometric indicator (C.I. 14645 / Solochrome Black T) for EDTA titrations and water hardness testing.
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Frequently Asked Questions
1. How is Eriochrome Black T indicator prepared for EDTA water hardness titrations?
It can be prepared as a dry mixture (0.5g Eriochrome Black T ground with 100g NaCl) or as a liquid solution dissolved in triethanolamine and ethanol for enhanced shelf life.
2. What is the color change of Eriochrome Black T at the endpoint?
In the presence of metal ions at pH 10, the solution appears wine-red. When EDTA completely chelates the metal ions at the endpoint, the solution turns clear blue.
3. Can academic institutions and testing labs purchase this via GeM with GST invoices?
Yes, Apex Labs supplies all Oxford Lab Fine Chem products with itemized GST tax invoices for ITC compliance and supports direct bidding and institutional supply through the Government e-Marketplace (GeM) portal.
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