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Phenolphthalein CAS 77-09-8 - White Crystalline Powder from China Suppliers & Factory for 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
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 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. Also used for pH indication in the electroplating industry, as well as in teaching experiments and chemical detection kits.
Package & Storage
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Package
25 kg / Drum
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Storage
Store in a cool, dry place.
Frequently Asked Questions
QWhat is the purity specification of this product?
The assay specification is 98.0% – 101.0% (C₂₀H₁₄O₄), ensuring high purity suitable for pharmaceutical and analytical applications.
QWhat is the pH transition range for use 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.
QWhat are the microbiological standards for this product?
The product must meet the following microbiological standards: TPC < 1000 cfu/g, Yeast & Mold < 100 cfu/g, and absence of E-coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces.
QHow should this product be stored?
It should be stored in a cool, dry place, away from moisture and heat sources, to maintain product quality and stability.
QWhat packaging is available for this product?
The product is available in 25 kg drums, suitable for both laboratory and industrial-scale procurement.
QWhat industries commonly use this product?
This product is widely used across multiple industries including pharmaceuticals (as a raw material and research reagent), analytical chemistry (titration indicator), water quality testing, electroplating (pH indication), and educational laboratory experiments.