Molekula
Hydroxynaphthol blue
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
Hydroxynaphthol blue is a sodium salt dye used as a metal ion indicator in complexometric titrations, particularly for calcium and magnesium. It appears as a dark blue crystalline powder. CAS: 63451-35-4, Molecular Formula: C20H11N2Na3O11S3, Molecular Weight: 620.47 g/mol. Store at ambient temperature. Signal word: Danger. Molekula supplies Hydroxynaphthol blue 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.
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.
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10 g — £62.00 per pack ex VAT · £74.40 inc. VAT
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Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Black coloured powder |
| Melting Point | 800 -802°C |
| Boiling Point | 1412 - 1414°C |
| Solubility in water | Soluble in water |
| Suitability as a metal indicator | Passes test |
| Loss on Drying (105°C) | ≤5.0% |
| Absorption maxima (buffer pH 12.0) | 646 nm +/- 2nm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | III |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90027610 |
| CAS Number | 63451-35-4 |
| IUPAC Name | trisodium;3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2,7-disulfonate |
| EC Number | 264-197-7 |
| Molecular Formula | C20H11N2Na3O11S3 |
| Molecular Weight | 620.47 |
| Exact Mass | 619.9218 |
| SMILES | C1=CC=C2C(=C1)C(=CC(=C2N=NC3=C4C=CC(=CC4=CC(=C3O)S(=O)(=O)[O-])S(=O)(=O)[O-])O)S(=O)(=O)[O-].[Na+].[Na+].[Na+] |
| InChIKey | AUIINJJXRXMPGT-UHFFFAOYSA-K |
| InChI | InChI=1S/C20H14N2O11S3.3Na/c23-15-9-16(35(28,29)30)13-3-1-2-4-14(13)18(15)21-22-19-12-6-5-11(34(25,26)27)7-10(12)8-17(20(19)24)36(31,32)33;;;/h1-9,23-24H,(H,25,26,27)(H,28,29,30)(H,31,32,33);;;/q;3*+1/p-3 |
| PubChem CID | 113232 |
| UN Number | UN3261 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29270040 |
| Tariff Code | 2927000090 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- H314 Causes severe skin burns and eye damage
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P333+313 IF skin irritation or a rash occurs: Get medical advice/attention
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, 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
- 1,1'-Azonaphthalene, 2,2'-dihydroxy-3,3',6-trisulfonic acid-, trisodium salt
- Hydroxynapthol Blue (Technical Grade)
Frequently asked questions
What is Hydroxynaphthol blue used for?
It is primarily used as a metal ion indicator in complexometric titrations, especially for detecting calcium and magnesium ions.
What is the chemical formula and molecular weight of Hydroxynaphthol blue?
The formula is C20H11N2Na3O11S3 with a molecular weight of 620.47 g/mol.
How should Hydroxynaphthol blue be stored?
It should be stored at ambient temperature, protected from light and moisture.
What grade is available for Hydroxynaphthol blue?
Available in analytical grade for laboratory use.
Can Molekula supply Hydroxynaphthol blue in bulk?
Yes, Molekula can supply Hydroxynaphthol blue in bulk quantities—please contact sales for details.
What documentation comes with a purchase of Hydroxynaphthol blue?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS) compliant with GHS standards.
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.