Organic Chemicals
01
Phenolphthalein CAS 77-09-8
Typical Properties
| Item | Specifications |
| Characteristics | A white or almost white powder, practically insoluble in water, soluble in alcohol. |
| Melting Point | It melts at about 260℃ |
| Identification | A: Positive B: Positive |
| Appearance of solution | The solution is clear and not more intensely colored than reference solution Y7 |
| Related substances | Less than 0.5% |
| Heavy metals | Not more than0.001% |
| Acidity or alkalinity | Complies |
| Chlorides | Not more than 0.01% |
| Sulphates | Not more than 0.02% |
| Loss on drying | Not more than 0.5% |
| Sulphated ash | Not more than 0.1% |
| Assay | 98.0%-101.0%(C2OHi4O4) |
| Microorganism | TPC<1000cfu/g |
| Y and M <100cfu/g | |
| E-coli – absent | |
| Staphylococcus Aureus-Absent | |
| Pseudomonas Aeruginosa-Absent | |
| Albicans Saccharomyces-Absent |
Application
1. Acid-Base Indicator
Widely used in chemical experiments, water quality testing, and industrial titration analysis.
Transition Range: pH 8.2 – 10.0
Color Change: Colorless in acidic → Colorless in neutral → Pink/Purple-red in alkaline solutions.
2. Pharmaceutical Uses
Historically used as a stimulant laxative to stimulate colonic mucosa and promote peristalsis. Currently, it is primarily used as a pharmaceutical raw material and research reagent, with clinical usage significantly reduced.
3. Industrial & Laboratory Applications
Serves as an analytical reagent and titration indicator. It is also used for pH indication in the electroplating industry, as well as in teaching experiments and chemical detection kits.
Package
25kg/drum
Storage
Store in a cool, dry place.