77-09-8
Product Name:
Phenolphthalein
Formula:
C20H14O4
Synonyms:
3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone
Inquiry
CHEMICAL AND PHYSICAL PROPERTIES
| Physical Description | Phenolphthalein appears as white or yellowish-white to pale orange fine crystalline powder. Odorless. Aqueous solution is acidic. Colorless to pH 8.5; pink to deep-red above pH 9. Colorless in presence of large amounts of alkali. Tasteless. (NTP, 1992) |
|---|---|
| Color/Form | White or yellowish-white minute, triclinic crystals, often twinned |
| Odor | ODORLESS |
| Melting Point | 496 to 504 °F (NTP, 1992) |
| Solubility | less than 1 mg/mL at 66 °F (NTP, 1992) |
| Density | 1.299 at 77 °F (NTP, 1992) - Denser than water; will sink |
| Vapor Pressure | 6.7X10-13 mm Hg @ 25 °C /Estimated/ |
| LogP | 2.41 |
| Henry's Law Constant | Henry's Law constant = 9.0X10-16 atm-cu m/mol @ 25 °C /Estimated/ |
| Stability/Shelf Life | Stable in air. |
| Decomposition | When heated to decomposition it emits acrid smoke and irritating fumes. |
| Dissociation Constants | 9.7 (at 25 °C) |
| Collision Cross Section | 172.1 Ų [M+H]+ [CCS Type: TW, Method: calibrated with polyalanine and drug standards] |
| Other Experimental Properties | Solutions are colorless to pH 8.5; pink to deep-red, above pH 9 |
| Chemical Classes | Dyes -> Indicator Dyes |
SAFETY INFORMATION
| Signal word | Danger |
|---|---|
| Pictogram(s) |
 Exclamation Mark Irritant GHS07  Health Hazard GHS08 |
| GHS Hazard Statements |
H315:Skin corrosion/irritation H341:Germ cell mutagenicity H350:Carcinogenicity |
| Precautionary Statement Codes |
P202:Do not handle until all safety precautions have been read and understood. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P280:Wear protective gloves/protective clothing/eye protection/face protection. P302+P352:IF ON SKIN: wash with plenty of soap and water. P308+P313:IF exposed or concerned: Get medical advice/attention. P332+P313:IF SKIN irritation occurs: Get medical advice/attention. |
COMPUTED DESCRIPTORS
| Molecular Weight | 318.3 g/mol |
|---|---|
| XLogP3 | 3.6 |
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 2 |
| Exact Mass | 318.08920892 g/mol |
| Monoisotopic Mass | 318.08920892 g/mol |
| Topological Polar Surface Area | 66.8 Ų |
| Heavy Atom Count | 24 |
| Formal Charge | 0 |
| Complexity | 438 |
| Isotope Atom Count | 0 |
| Defined Atom Stereocenter Count | 0 |
| Undefined Atom Stereocenter Count | 0 |
| Defined Bond Stereocenter Count | 0 |
| Undefined Bond Stereocenter Count | 0 |
| Covalently-Bonded Unit Count | 1 |
| Compound Is Canonicalized | Yes |
PRODUCT INTRODUCTION
description
Phenolphthalein appears as white or yellowish-white to pale orange fine crystalline powder. Odorless. Aqueous solution is acidic. Colorless to pH 8.5; pink to deep-red above pH 9. Colorless in presence of large amounts of alkali. Tasteless. (NTP, 1992)