Hot Products
0102030405
Phenolphthalein CAS 77-09-8: Quality Chemical from China Suppliers and Factory - White Crystalline Powder 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
🧪 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 (acidic / neutral) → Pink/Purple-red (alkaline)
💊 Pharmaceutical Uses
Historically used as a stimulant laxative to stimulate colonic mucosa and promote peristalsis.
Currently primarily used as a pharmaceutical raw material and research reagent, with clinical usage significantly reduced.
🏭 Industrial & Laboratory
Serves as an analytical reagent and titration indicator. 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
Q
What is the purity specification of this product?
The assay specification is 98.0%–101.0% (C₂₀H₁₄O₄), ensuring high-purity pharmaceutical and analytical grade quality.
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 solution appears colorless in acidic and neutral conditions, and turns pink to purple-red in alkaline solutions.
Q
Is this product suitable for pharmaceutical manufacturing?
Yes. It meets pharmaceutical-grade standards and is used as a raw material and research reagent. It complies with microbiological limits including absence of E-coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces.
Q
What are the microbiological requirements for this product?
The product must have a Total Plate Count (TPC) of less than 1000 cfu/g, Yeast and Mold less than 100 cfu/g, and tested pathogens including E-coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces must all be absent.
Q
How should this product be stored and what is the standard packaging?
The product should be stored in a cool, dry place to maintain its quality and stability. Standard packaging is 25 kg per drum.
Q
What industrial applications does this product support?
Beyond laboratory use, it serves as an analytical reagent and pH indicator in the electroplating industry, and is also applied in teaching experiments and chemical detection kits.