Molekula
Eriochrome Black T (C.I. 14645)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Eriochrome Black T (C.I. 14645) is a metallochromic indicator used in complexometric titrations, particularly for determining water hardness. It appears as a dark green powder and changes color in response to metal ion concentration. CAS: 1787-61-7, Molecular Formula: C20H12N3NaO7S, Molecular Weight: 461.38 g/mol. Store at ambient temperature. Signal word: Warning. Molekula supplies Eriochrome Black T from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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25 g — $79.50 per pack
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100 g — $188.10 per pack
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Black powder |
| Strength | ≥100.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 9 |
| Packing Group | III |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 51499212 |
| CAS Number | 1787-61-7 |
| IUPAC Name | sodium 3-hydroxy-4-[(1-hydroxynaphthalen-2-yl)diazenyl]-7-nitronaphthalene-1-sulfonate |
| EC Number | 217-250-3 |
| Molecular Formula | C20H12N3NaO7S |
| Molecular Weight | 461.38 |
| Exact Mass | 461.0294 |
| SMILES | C1=CC=C2C(=C1)C=CC(=C2O)N=NC3=C4C=CC(=CC4=C(C=C3O)S(=O)(=O)[O-])[N+](=O)[O-].[Na+] |
| InChIKey | AMMWFYKTZVIRFN-UHFFFAOYSA-M |
| InChI | InChI=1S/C20H13N3O7S.Na/c24-17-10-18(31(28,29)30)15-9-12(23(26)27)6-7-14(15)19(17)22-21-16-8-5-11-3-1-2-4-13(11)20(16)25;/h1-10,24-25H,(H,28,29,30);/q;+1/p-1 |
| PubChem CID | 135465089 |
| UN Number | UN3077 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29270040 |
| Tariff Code | 2927000090 |
Safety & GHS
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Health Hazard
GHS07
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Hazardous to the Environment
GHS09
Hazard statements
- H319 Causes serious eye irritation
- H332 Harmful if inhaled
- H400 Very toxic to aquatic life
- H411 Toxic to aquatic life with long lasting effects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P337+313 If eye irritation persists get medical advice/attention
- P501 Dispose of contents/container to an approved waste disposal plant
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Acid Chrome Black A
- C.I. Mordant Black 11, monosodium salt
- Diacromo Black PA
- eriochrome black t
- Fast Chrome Black T
- Hispacrom Black T
- Magracrom Black A
- Mordant Black 11
- Solochrome Black
- Solochrome Black T
Frequently asked questions
What is Eriochrome Black T used for?
Eriochrome Black T is primarily used as a metal ion indicator in complexometric titrations, especially for detecting calcium and magnesium ions in water hardness tests.
What is the chemical formula and molecular weight of Eriochrome Black T?
The formula is C20H12N3NaO7S with a molecular weight of 461.38 g/mol.
How should Eriochrome Black T be stored?
It should be stored at ambient temperature, protected from moisture and light.
What grade of Eriochrome Black T does Molekula supply?
Molekula supplies Eriochrome Black T in analytical grade, suitable for laboratory use.
Can Molekula supply Eriochrome Black T in bulk?
Yes, Molekula can supply Eriochrome Black T in bulk quantities—please contact our sales team for pricing and availability.
What documentation comes with an order of Eriochrome Black T?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.