Molekula
o-Cresolphthalein
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
o-Cresolphthalein is a synthetic organic compound primarily used as a pH indicator in analytical chemistry, particularly for detecting alkaline solutions (pH 8.2–9.8). It appears colorless in acidic and neutral conditions but turns bright pink in strongly basic environments, making it ideal for titrations and laboratory testing. This chemical has a CAS number of 596-27-0, with the molecular formula C22H18O4 and a molecular weight of 346.38. It is stable at ambient storage conditions and carries no signal word for hazard classification. Molekula supplies o-Cresolphthalein 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 — £46.50 per pack ex VAT · £55.80 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 | Beige/Cream to yellow powder |
| Identification | Conforms to reference |
| pH | 6.0-7.0 |
| Solubility test in ethanol | Complies |
| pH Transition - Colour Change | 8.2 (colorless) to 9.8 (red) |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 15685521 |
| CAS Number | 596-27-0 |
| IUPAC Name | 3,3-bis(4-hydroxy-3-methylphenyl)-2-benzofuran-1-one |
| Molecular Formula | C22H18O4 |
| Molecular Weight | 346.38 |
| Exact Mass | 346.1205 |
| SMILES | CC1=C(C=CC(=C1)C2(C3=CC=CC=C3C(=O)O2)C4=CC(=C(C=C4)O)C)O |
| InChIKey | CPBJMKMKNCRKQB-UHFFFAOYSA-N |
| InChI | InChI=1S/C22H18O4/c1-13-11-15(7-9-19(13)23)22(16-8-10-20(24)14(2)12-16)18-6-4-3-5-17(18)21(25)26-22/h3-12,23-24H,1-2H3 |
| PubChem CID | 68995 |
| REACH Code | Y113 |
| TSCA Listed | Yes |
| HTS Code | 29322045 |
| Tariff Code | 2932209090 |
Safety & GHS
Precautionary statements
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P410+403 Protect from sunlight. Store in a well ventilated place
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(3H)-Isobenzofuranone, 3,3-bis(4-hydroxy-3-methylphenyl)-
- 3,3-bis(4-hydroxy-3-methyl-phenyl)isobenzofuran-1-one
- 3,3-Bis(4-hydroxy-3-methylphenyl)-1(3H)-isobenzofuranone
- 3,3-bis(4-hydroxy-3-methylphenyl)-2-benzofuran-1-one
- 3,3-bis(4-hydroxy-3-methylphenyl)-3-hydroisobenzofuran-1-one
- 3,3-Bis(4-hydroxy-3-methylphenyl)isobenzofuran-1(3H)-one
- 3,3'-Dimethylphenolphthalein
- Cresolphthalein
- CRESOLPHTHALEIN, O-
- Phenolphthalein, 3',3''-dimethyl-
Frequently asked questions
What is o-Cresolphthalein commonly used for?
o-Cresolphthalein is primarily used as a pH indicator in analytical chemistry, particularly for detecting alkaline solutions (color change from colorless to pink/red in pH 8.3–10.0). It is also used in titrations.
What is the chemical formula and molecular weight of o-Cresolphthalein?
The chemical formula is C₂₂H₁₈O₄, and the molecular weight is 346.38 g/mol.
How should o-Cresolphthalein be stored?
Store o-Cresolphthalein at ambient temperature in a tightly sealed container, protected from light and moisture. No special refrigeration is required.
What grades or purity levels of o-Cresolphthalein does Molekula supply?
Molekula supplies analytical reagent (AR) grade o-Cresolphthalein, meeting high-purity standards for laboratory and analytical applications.
Can Molekula supply o-Cresolphthalein in bulk quantities?
Yes, Molekula can provide o-Cresolphthalein in bulk quantities upon request, with flexible packaging options (e.g., drums, bottles) depending on order size.
What documentation is provided with an order of o-Cresolphthalein?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation to verify purity and compliance with specifications.
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.