Molekula
Cresol Red sodium salt
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
Cresol Red sodium salt is a pH-sensitive dye used as an acid-base indicator, particularly in titrations and analytical chemistry for detecting pH changes around 7.4–9.0. It appears yellow in acidic solutions and red in alkaline conditions, making it useful in biological and clinical assays. This chemical has a CAS number of 62625-29-0, molecular formula C21H17NaO5S, and a molecular weight of 404.41 g/mol. It is stable at ambient storage conditions and carries no signal word for hazard classification. Molekula supplies Cresol Red sodium 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.
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 — £46.70 per pack ex VAT · £56.04 inc. VAT
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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.
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Specifications
| Property | Value |
|---|---|
| Appearance | Orange to orange-brown to very dark brown crystalline powder and/or crystals |
| Loss on Drying | ≤5% (1 hour @ 110°C) |
| Assay | ≥90% (Spectrophotometry) |
| Visual Transition Interval | From pH 0.2 (orange) To pH 2.5 (Brownish-yellow) From pH 6.8 (yellow) To pH 8.8 (purple) |
| Solubility (1mg/ml H2O) | Clear, dark red solution |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 21771676 |
| CAS Number | 62625-29-0 |
| IUPAC Name | sodium 4-[3-(4-hydroxy-3-methylphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]-2-methylphenolate |
| EC Number | 263-654-8 |
| Molecular Formula | C21H17NaO5S |
| Molecular Weight | 404.41 |
| Exact Mass | 404.0694 |
| SMILES | CC1=C(C=CC(=C1)C2(C3=CC=CC=C3S(=O)(=O)O2)C4=CC(=C(C=C4)[O-])C)O.[Na+] |
| InChIKey | FMKJVYROEYMYFV-UHFFFAOYSA-M |
| InChI | InChI=1S/C21H18O5S.Na/c1-13-11-15(7-9-18(13)22)21(16-8-10-19(23)14(2)12-16)17-5-3-4-6-20(17)27(24,25)26-21;/h3-12,22-23H,1-2H3;/q;+1/p-1 |
| PubChem CID | 23692294 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 2914794000 |
| Tariff Code | 2914790090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
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
- Cresol Red (sodium) (IND)
- Cresol red sodium
- FMKJVYROEYMYFV-UHFFFAOYSA-M
- Sodium 4-(3-(4-hydroxy-3-me
- Sodium cresol red
Frequently asked questions
What is Cresol Red sodium salt primarily used for?
Cresol Red sodium salt is commonly used as a pH indicator in laboratories, particularly for titrations in the pH range of 7.2–8.8, transitioning from yellow to purple-red.
What is the molecular formula and molecular weight of Cresol Red sodium salt?
The molecular formula is **C₂₁H₁₇NaO₅S**, and the molecular weight is **404.41 g/mol**.
How should Cresol Red sodium salt be stored?
Store at **ambient temperature** in a tightly sealed container, protected from moisture and light.
What grades of purity are available for Cresol Red sodium salt?
Molekula supplies **analytical and reagent-grade** Cresol Red sodium salt, meeting standard laboratory requirements.
Can Molekula supply Cresol Red sodium salt in bulk quantities?
Yes, bulk quantities are available upon request—contact our sales team for custom packaging and pricing.
What documentation is provided with an order of Cresol Red sodium salt?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
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.