Molekula
o-Cresolphthalein 98%
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 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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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.
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.