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Phenolphthalein CAS 77-09-8 - 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
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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.
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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.
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3. Industrial & Laboratory
Serves as an analytical reagent and titration indicator.
Used for pH indication in the electroplating industry, teaching experiments, and chemical detection kits.
Package
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Standard Packaging
25 kg / Drum
Storage
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Storage Conditions
Store in a cool, dry place.
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Frequently Asked Questions (FAQ)
Q
What is the purity assay range for this product?
The assay range for this product is 98.0%–101.0% (C₂₀H₁₄O₄), ensuring high-grade purity suitable for pharmaceutical and industrial applications.
Q
What pH range does this indicator cover, and what color change occurs?
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, making it ideal for titration analysis.
Q
What are the main industrial and laboratory applications of this product?
It is widely used as an analytical reagent, titration indicator, and for pH indication in the electroplating industry. It is also commonly employed in teaching experiments and chemical detection kits.
Q
What are the microbial limits for this product?
The product meets strict microbial standards: TPC < 1000 cfu/g, Yeast & Mold < 100 cfu/g. Pathogens including E. coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces are all absent.
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How should this product be stored, and what is the standard packaging?
The product should be stored in a cool, dry place away from moisture and direct sunlight. It is packaged in 25 kg drums, suitable for industrial-scale procurement and transport.
Q
What are the heavy metal and related substance limits?
The heavy metal content is controlled to not more than 0.001%, and related substances are limited to less than 0.5%, ensuring the product meets high-purity standards for pharmaceutical and laboratory use.