Hot Products
0102030405
Phenolphthalein Powder CAS 77-09-8 - China Suppliers and Factory for Quality 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.
💊 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 & Storage
📦
Package
25 kg / Drum
🌡️
Storage
Store in a cool, dry place.
❓ Frequently Asked Questions
💬
What is the purity specification of this product?
The assay specification is 98.0%–101.0% (C₂₀H₁₄O₄), ensuring high purity suitable for pharmaceutical, industrial, and laboratory use.
💬
What is the pH transition range when used as an acid-base indicator?
The transition range is pH 8.2 – 10.0. The color changes from colorless in acidic and neutral conditions to pink/purple-red in alkaline solutions.
💬
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, but clinical usage has been significantly reduced in modern practice.
💬
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 absent for E-coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces.
💬
How should this product be stored?
It should be stored in a cool, dry place, away from moisture and direct sunlight, to maintain product quality and stability over time.
💬
What is the standard packaging for this product?
The product is packaged in 25 kg drums. Custom packaging options may be available — please contact us for specific requirements.