Phenolphthalein TS ACS PurReagent
ACS PurReagent
Properties
| M pt. | 261-263°C(lit.) |
| Density | 1.27 g/cm3 at 32 °C |
| Form | Powder |
Safety Information
| Hazard Statement(s) | H315,H341,H350,H361f |
| Precautionary Statement | P202 - P264 - P280 - P302 + P352 - P308 + P313 - P332 + P313 |
| GHS Pictogram |
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| Signal word | Danger |
| Storage Temp. | Room Temperature |
| Storage Class | 6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects |
Description
Application
It serves as a classic pH indicator turning colorless (pH 8.2) to pinkmagenta (pH 10) in acid-base titrations formerly as a laxative in pharmaceuticals and in analytical chemistry for endpoint detection.
Purpose
Its primary purpose is visual pH detection via lactone ring-opening in basic conditions forming a resonance-stabilized quinoid anion absorbing 550 nm enabling precise strong acid-strong base titration endpoints.
General Description
Phenolphthalein (C20H14O4) is a white or pale yellow crystalline powder a triphenylmethane pH indicator and weak acid (pKa 9.7) featuring three fused benzene rings connected through a central phthalide lactone with molecular weight 318.33 gmol melting point 258263C density 1.277 gcm and solubility in alcohols but poor in water.
Documents
| SDS | |
| COA | |
| Specification | |
| Bulk quote order form | |
| Sample COA |