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Phenolphthalein CAS 77-09-8 - White Crystalline Powder from China Suppliers and Factory - Acid-Base Indicator
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 than 0.001% |
| 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% (C₂₀H₁₄O₄) |
| Microorganism | TPC < 1000 cfu/g |
| Y and M < 100 cfu/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.
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
📦
Packaging
25 kg / Drum
Storage
🌡️
Storage Conditions
Store in a cool, dry place.
Frequently Asked Questions
Q
What is the purity specification of this product?
The assay specification is 98.0%–101.0% (C₂₀H₁₄O₄), ensuring high-quality pharmaceutical and laboratory grade material.
Q
What is the pH transition range when used as an acid-base indicator?
The transition range is pH 8.2 to 10.0. The color changes from colorless in acidic and neutral conditions to pink or purple-red in alkaline solutions.
Q
Is this product suitable for pharmaceutical applications?
Yes. It is primarily used as a pharmaceutical raw material and research reagent. Historically it was used as a stimulant laxative, though clinical usage has significantly reduced in modern practice.
Q
What are the microbiological standards for this product?
The product meets strict microbiological standards: TPC < 1000 cfu/g, Yeast & Mold < 100 cfu/g, and is free from E. coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces.
Q
How should this product be stored?
It should be stored in a cool, dry place, away from moisture and direct sunlight, to maintain its quality and shelf life.
Q
What packaging is available and what is the standard unit?
The product is packaged in 25 kg drums, suitable for industrial, laboratory, and pharmaceutical procurement needs.