China Phenolphthalein CAS 77-09-8: Quality Chemical from China Suppliers and Factory - White Crystalline Powder Indicator Factories, Product

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Chemical Name: Phenolphthalein 
, CAS No.: 77-09-8
, Molecular Formula: C6H12O3
, Molecular Weight: 318.32
, Appearance: White crystalline powder
, Sample: Free samples available
, Solubility: Soluble in ethanol and diethyl ether; practically insoluble in water.
, Characteristics: Phenolphthalein is a classic acid-base indicator that turns pink/purple-red in alkaline solutions while remaining colorless in neutral and acidic conditions. As a leading supplier and manufacturer in China, we are proud to offer high-quality Phenolphthalein sourced directly from our factory, ensuring top-tier performance for various applications.

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Product Description

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

Widely used in chemical experiments, water quality testing, and industrial titration analysis.

Transition Range pH 8.2 – 10.0

Color Change Colorless (acidic / neutral) → Pink/Purple-red (alkaline)

💊 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.

🏭 Industrial & Laboratory

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 & 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 purity specification of this product?
The assay specification is 98.0%–101.0% (C₂₀H₁₄O₄), ensuring high-purity pharmaceutical and analytical grade quality.
Q What is the pH transition range when used as an acid-base indicator?
The transition range is pH 8.2 to 10.0. The solution appears colorless in acidic and neutral conditions, and turns pink to purple-red in alkaline solutions.
Q Is this product suitable for pharmaceutical manufacturing?
Yes. It meets pharmaceutical-grade standards and is used as a raw material and research reagent. It complies with microbiological limits including absence of E-coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces.
Q What are the microbiological requirements for this product?
The product must have a Total Plate Count (TPC) of less than 1000 cfu/g, Yeast and Mold less than 100 cfu/g, and tested pathogens including E-coli, Staphylococcus Aureus, Pseudomonas Aeruginosa, and Albicans Saccharomyces must all be absent.
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 quality and stability. Standard packaging is 25 kg per drum.
Q What industrial applications does this product support?
Beyond laboratory use, it serves as an analytical reagent and pH indicator in the electroplating industry, and is also applied in teaching experiments and chemical detection kits.

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