Factory Supply Phenolphthalein Cas 77 - 09 - 8 With Best Price: User Guide

Table of Contents

• Basic Information and Parameters
• Product Uses
• Product Usage
• Usage Case Studies
• Contact Information

Basic Information and Parameters

Phenolphthalein, with the CAS number 77 - 09 - 8, is a widely recognized chemical compound. Its chemical formula is C₂₀H₁₄O₄, and it has a molecular weight of 318.32 g/mol. Phenolphthalein appears as a white to yellowish - white crystalline powder. It is sparingly soluble in water but soluble in ethanol and ether. This product is supplied directly from the factory, ensuring high - quality and cost - effective procurement for our customers.

Product Uses

1. **Indicator in Chemistry**: Phenolphthalein is commonly used as an acid - base indicator in titration experiments. In acidic solutions, it remains colorless, while in basic solutions with a pH above approximately 8.2, it turns bright pink. This property makes it an essential tool in chemical analysis laboratories for determining the endpoint of acid - base reactions.
2. **Medical Applications**: Historically, it was used as a laxative. However, its use in over - the - counter laxatives has been restricted due to potential health risks. Nevertheless, it still plays a role in some medical research and diagnostic procedures.
3. **Industrial Dyeing and Testing**: In the industrial field, phenolphthalein can be used in certain dyeing processes and as a testing agent to detect the presence of alkaline substances on surfaces or in solutions.

Product Usage

1. **As an Indicator in Titration**:
- Prepare a solution of phenolphthalein by dissolving an appropriate amount in ethanol. A common concentration is 1% (w/v).
- Add a few drops of the phenolphthalein solution to the sample solution to be titrated.
- Slowly add the titrant (either an acid or a base, depending on the nature of the sample) until the color change occurs. The appearance or disappearance of the pink color indicates the endpoint of the titration.
2. **In Industrial Testing**:
- For surface testing, dissolve phenolphthalein in a suitable solvent and apply it to the surface to be tested. If the surface contains alkaline substances, a pink color will appear at the contact points.
- In solution testing, add a small amount of the phenolphthalein solution to the test solution and observe for color changes.

Usage Case Studies

**Case 1: Acid - Base Titration in a School Laboratory**
In a high - school chemistry class, students were conducting an acid - base titration experiment to determine the concentration of hydrochloric acid. They prepared a phenolphthalein indicator solution and added a few drops to the hydrochloric acid sample. As they slowly added sodium hydroxide solution (the titrant), the solution remained colorless until the equivalence point was reached. At that moment, a faint pink color appeared, indicating the endpoint of the titration. This allowed the students to calculate the concentration of the hydrochloric acid accurately using the volume of the titrant added.
**Case 2: Industrial Surface Testing**
A manufacturing company was producing metal components and needed to ensure that the surfaces were free from alkaline residues. They prepared a phenolphthalein - based testing solution and applied it to the metal surfaces. In some areas, a pink color appeared, indicating the presence of alkaline substances. The company was then able to take corrective measures, such as additional cleaning steps, to ensure the quality of their products.

Contact Information

If you have any questions or need further information about our Factory Supply Phenolphthalein Cas 77 - 09 - 8, please feel free to contact us.
Email: info@vivalr.com
Phone: (86) 15866781826