Molekula
Phenolphthalein
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
Phenolphthalein is a pH indicator commonly used in titrations and as a component in certain laxatives. It appears as a white to pale yellow crystalline powder and turns pink in basic solutions. CAS: 77-09-8, Molecular Formula: C20H14O4, Molecular Weight: 318.32 g/mol. Store at ambient temperature. Signal word: Danger. Molekula supplies Phenolphthalein 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.
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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100 g — £24.70 per pack ex VAT · £29.64 inc. VAT
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1 kg — £108.80 per pack ex VAT · £130.56 inc. VAT
Need a different quantity or pack?
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.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White to off-white powder |
| Melting Point | 260 - 263°C |
| Loss on Drying | ≤ 0.5% (110°C) |
| Solubility | Practically insoluble in water, soluble in alcohol. |
| Assay | ≥ 98.0% |
| Sulphated Ash | ≤ 0.1% |
| Chlorides | ≤ 100mg/kg |
| Related Substances | ≤ 0.5% |
| Sulphates (SO4)(2-) | ≤ 200mg/kg |
| Identification (RAMAN) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White rhombic needles |
| Odour | Odorless |
| Melting Point | 262.5 °C |
| Water Solubility | 400 mg/L at room temperature |
| Vapour Pressure | 6.7 × 10⁻¹³ mmHg at 25 °C (Estimated) |
| pKa | pKa = 9.7 (at 25 °C) |
| log P (octanol/water) | 2.41 |
Source: PubChem CID 4764 (HSDB, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 13440009 |
| CAS Number | 77-09-8 |
| IUPAC Name | 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one |
| EC Number | 201-004-7 |
| Molecular Formula | C20H14O4 |
| Molecular Weight | 318.32 |
| Exact Mass | 318.0892 |
| SMILES | C1=CC=C2C(=C1)C(=O)OC2(C3=CC=C(C=C3)O)C4=CC=C(C=C4)O |
| InChIKey | KJFMBFZCATUALV-UHFFFAOYSA-N |
| InChI | InChI=1S/C20H14O4/c21-15-9-5-13(6-10-15)20(14-7-11-16(22)12-8-14)18-4-2-1-3-17(18)19(23)24-20/h1-12,21-22H |
| PubChem CID | 4764 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 2932.20.4500 |
| Tariff Code | 2932201000 |
Safety & GHS
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H315 Causes skin irritation
- H341 Suspected of causing genetic defects
- H350 May cause cancer
- H361f Suspected of damaging fertility.
- H401 Toxic to aquatic life
Precautionary statements
- P201 Obtain special instructions before use
- P263 Avoid contact during pregnancy/while nursing
- P273 Avoid release to the environment
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P362 Take off contaminated clothing and wash before reuse
Documents
Safety Data Sheets (SDS)
Available in English, English (US), French, German, Italian, Portuguese, 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
- Espotabs
- Euchessina
- Koprol
- Laxogen
- Phenolax
- Phthalimetten
- Phthalin
- Purga
- Purgophen
- Trilax
Frequently asked questions
What is phenolphthalein used for?
Phenolphthalein is primarily used as a pH indicator in titrations, turning pink in basic solutions and colorless in acidic ones.
What is the chemical formula and molecular weight of phenolphthalein?
The chemical formula is C20H14O4, and the molecular weight is 318.32 g/mol.
How should phenolphthalein be stored?
Phenolphthalein should be stored at ambient temperature, away from moisture and direct light.
What grade of phenolphthalein does Molekula supply?
Molekula supplies phenolphthalein in analytical grade.
Can Molekula supply phenolphthalein in bulk?
Yes, Molekula can supply phenolphthalein in bulk quantities—please contact our sales team for details.
What documentation comes with a phenolphthalein order?
Each order includes a Certificate of Analysis (CoA) and Safety Data Sheet (SDS) with the shipment.
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.