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Phenolphthalein CAS 77-09-8 - China Suppliers & Factory for High-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
Acid-Base Indicator
pH 8.2 – 10.0
Widely used in chemical experiments, water quality testing, and industrial titration analysis.
Color Change: Colorless in acidic → Colorless in neutral → Pink/Purple-red in alkaline solutions.
Pharmaceutical Uses
Pharmaceutical Raw Material
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
Analytical Reagent
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
Standard Packaging
25 kg / Drum
Storage
Storage Conditions
Store in a cool, dry place.
Frequently Asked Questions
Q1
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.
Q2
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/purple-red in alkaline solutions.
Q3
What are the main industrial and laboratory applications?
It is used as an analytical reagent, titration indicator, and pH indicator in the electroplating industry. It is also widely applied in teaching experiments and chemical detection kits.
Q4
What are the standard packaging and storage requirements?
The product is packaged in 25 kg drums. It should be stored in a cool, dry place to maintain product stability and quality.
Q5
What microbiological standards does this product meet?
The product meets strict microbiological standards: TPC < 1000 cfu/g, Yeast & Mold < 100 cfu/g, and is confirmed absent for E-coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces.
Q6
What are the physical characteristics of this product?
It appears as a white or almost white powder, practically insoluble in water but soluble in alcohol. Its melting point is approximately 260℃.