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Phenolphthalein CAS 77-09-8 - High-Quality Acid-Base Indicator from China Suppliers and 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
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 (acidic) → Colorless (neutral) → Pink/Purple-red (alkaline)
⚗ Transition Range: pH 8.2 – 10.0
🎨 Color Change: Colorless (acidic) → Colorless (neutral) → Pink/Purple-red (alkaline)
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
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.
Q
What is the assay purity specification?
The assay specification is 98.0%–101.0% (C₂₀H₁₄O₄), ensuring a high level of purity suitable for pharmaceutical and laboratory applications.
Q
What are the main industrial and laboratory uses?
It is widely used as an analytical reagent and titration indicator, for pH indication in the electroplating industry, and in teaching experiments and chemical detection kits.
Q
How should this product be stored?
The product should be stored in a cool, dry place away from moisture and direct sunlight to maintain its quality and stability.
Q
What is the standard packaging for this product?
The product is packaged in 25 kg drums, suitable for bulk industrial and pharmaceutical procurement.
Q
Does the product meet microbiological safety standards?
Yes. The product complies with strict microbiological specifications: TPC < 1000 cfu/g, Yeast & Mold < 100 cfu/g, and is confirmed absent for E. coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces.