Molekula
o-Cresolphthalein 98%
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 1999 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
o-Cresolphthalein 98% is a synthetic pH indicator and analytical reagent, primarily used in acid-base titrations and as a colorimetric agent in laboratory settings. It changes color from colorless to pink in alkaline conditions, making it ideal for detecting pH shifts around 8.3–9.8. This chemical has a CAS number of 596-27-0, with the molecular formula C22H18O4 and a molecular weight of 346.38 g/mol. It is stable at ambient storage conditions and carries no signal word for hazard classification. Molekula supplies o-Cresolphthalein 98% 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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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 | Slant yellow to off-white to light brown powder |
| Assay | ≥98% |
| Solubility in Ethanol | Passes Test |
| pH Transition - Colour Change | 8.2 (colourless) - 9.8 (red) |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90038545 |
| 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.
Quality certificates
Molekula Group is certified to ISO 9001:2015 (quality) and ISO 14001:2015 (environmental management), audited by a UKAS-accredited body. Both certificates are valid to 17 May 2028.
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 98% commonly used for?
o-Cresolphthalein is primarily used as a pH indicator in analytical chemistry, particularly for detecting strong bases (pH 8.2–9.8) and 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 98% be stored?
Store at ambient temperature in a tightly sealed container, away from moisture and direct sunlight.
What purity grade is available for o-Cresolphthalein from Molekula?
Molekula supplies o-Cresolphthalein at 98% purity as standard.
Can Molekula supply o-Cresolphthalein in bulk quantities?
Yes, bulk quantities are available upon request—please contact our sales team for pricing and lead times.
What documentation comes with an order of o-Cresolphthalein?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and a packing list.
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.