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Phenolphthalein CAS 77-09-8 - White Crystalline Powder from Reliable China Suppliers & Factory
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
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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.
pH 8.2 – 10.0
Transition Range: pH 8.2 – 10.0
Color Change: Colorless in acidic → Colorless in neutral → Pink/Purple-red in alkaline solutions.
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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.
Pharma Raw Material
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3. Industrial & Laboratory Applications
Serves as an analytical reagent and titration indicator. Also used for pH indication in the electroplating industry, as well as in teaching experiments and chemical detection kits.
Analytical Reagent
Package & Storage
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Package
25 kg / Drum
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Storage
Store in a cool, dry place.
❓ Frequently Asked Questions
Q
What is the pH transition range of this 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, making it ideal for titration analysis.
Q
What is the purity (assay) specification of this product?
The assay specification is 98.0%–101.0% (C₂₀H₁₄O₄), ensuring high purity suitable for pharmaceutical and analytical applications.
Q
Is this product safe from microbial contamination?
Yes. 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.
Q
What are the main industrial applications of this product?
It is widely used as an analytical reagent and titration indicator in laboratories, for pH indication in the electroplating industry, in teaching experiments, and in chemical detection kits.
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 stability and quality. Standard packaging is 25 kg per drum, suitable for both laboratory and industrial scale use.
Q
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℃, and it complies with acidity/alkalinity standards with a sulphated ash content of not more than 0.1%.