Molekula
Hydroxy naphthol blue disodium salt (C20H12N2O11S3Na2)
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
Hydroxy naphthol blue disodium salt is a chromogenic indicator used in complexometric titrations, particularly for detecting metal ions like calcium and magnesium. It appears as a dark blue crystalline powder and is soluble in water. CAS: 165660-27-5, Molecular Formula: C20H12N2O11S3Na2, Molecular Weight: 598.49 g/mol, Storage: Ambient, Signal Word: Warning. Molekula supplies Hydroxy naphthol blue disodium salt 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.
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25 g — $70.20 per pack
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Specifications
| Property | Value |
|---|---|
| Appearance | Dark blue powder or crystals |
| Loss on Drying | ≤ 6.0% |
| Absorptivity | 350 - 500, 1%/ 1cm in ammonia buffer pH 12.0 +2ml 0.05 M.E.T.D.A at λmax. 648.0nm |
| Identification (RAMAN) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90030492 |
| CAS Number | 165660-27-5 |
| IUPAC Name | disodium;3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]-7-sulfonaphthalene-2-sulfonate |
| Molecular Formula | C20H12N2O11S3Na2 |
| Molecular Weight | 598.49 |
| Exact Mass | 597.9399 |
| 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+] |
| InChIKey | WPDDXLRAJOPBIR-UHFFFAOYSA-L |
| InChI | InChI=1S/C20H14N2O11S3.2Na/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;2*+1/p-2 |
| PubChem CID | 135889525 |
| REACH Code | Y110 |
| Tariff Code | 29270000 |
Safety & GHS
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Health Hazard
GHS07
Hazard statements
- H319 Causes serious eye irritation
Precautionary statements
- 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
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian.
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
No alternate names recorded for this product.
Frequently asked questions
What is hydroxy naphthol blue disodium salt used for?
This dye is used as a metallochromic indicator in complexometric (EDTA) titrations, particularly for the determination of calcium at about pH 12–13, where the colour changes from red (metal complex) to blue (free indicator) at the endpoint. It is also used for visual, colorimetric detection of loop-mediated isothermal amplification (LAMP) reactions, where depletion of magnesium ions shifts the colour from violet to sky blue.
What is the molecular formula and molecular weight of hydroxy naphthol blue disodium salt?
The molecular formula is **C₂₀H₁₂N₂O₁₁S₃Na₂**, and the molecular weight is **598.49 g/mol**.
How should hydroxy naphthol blue disodium salt be stored?
Store at **ambient temperature** in a tightly sealed container, away from moisture and direct sunlight.
What grades or purities of hydroxy naphthol blue disodium salt does Molekula offer?
We supply **analytical-grade** hydroxy naphthol blue disodium salt, meeting high-purity standards for research and laboratory applications.
Can Molekula supply hydroxy naphthol blue disodium salt in bulk quantities?
Yes, we can accommodate bulk orders—please contact our sales team for pricing and lead time details.
What documentation comes with an order of hydroxy naphthol blue disodium salt?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
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