Description

Specifications Table

Product Name – Whatman Phenolphthalein Paper
Quantity/Pack Size – 7MMx5M (Pack of 1)
Form – Roll
Grade – Lab/Analytical
Application – pH testing (acid-alkali detection)

Product Overview

Whatman Phenolphthalein Paper is a high-precision pH indicator designed for accurate acid-alkali testing in laboratory and field applications. This lab-grade paper features a 7mm width and 5-meter length, providing ample supply for repeated use. The phenolphthalein indicator embedded in the paper undergoes a distinct color change from colorless to pink in alkaline conditions (pH 8.3–10.0), ensuring clear and immediate visual confirmation of pH levels. Engineered for consistency, this paper delivers reliable results without the need for additional equipment, making it ideal for quick spot tests or routine monitoring. The non-bleeding dye ensures sharp, easy-to-read transitions, while the durable cellulose base resists tearing during handling. Each roll is individually packaged to maintain integrity and prevent contamination, guaranteeing long-term performance. Whether used for qualitative analysis or educational demonstrations, this phenolphthalein paper offers a cost-effective, user-friendly solution for pH detection with minimal preparation.

FAQs

1. How does phenolphthalein paper detect pH changes?

The paper contains phenolphthalein dye, which remains colorless in acidic or neutral solutions (pH < 8.3) and turns pink in alkaline conditions (pH 8.3–10.0). The color intensity increases with higher alkalinity, providing a visual pH estimate.

2. Can this paper be used for quantitative pH measurement?

No, phenolphthalein paper is designed for qualitative or semi-quantitative testing. For precise numerical pH values, a pH meter or universal indicator paper with a color chart is recommended.

3. Is this paper compatible with organic solvents?

Phenolphthalein paper is primarily intended for aqueous solutions. Organic solvents may dissolve the dye or alter the color response, leading to inaccurate results.

4. How should unused phenolphthalein paper be stored?

Store the roll in its original packaging at room temperature (15–30°C), away from direct sunlight, moisture, and volatile chemicals. Keep the cap tightly sealed to prevent exposure to atmospheric CO₂, which can cause premature color changes.

5. What alternatives exist for testing strongly acidic solutions?

For pH testing below 8.3, use litmus paper (red or blue) or universal indicator paper, which cover a broader pH range (1–14). Methyl orange paper is another option for acidic solutions (pH 3.1–4.4).