Description
Specifications Table
Product Name – Bromothymol blue indicator paper Indicator
Quantity/Pack Size – 100 books
Form – Indicator paper strips
Grade – Laboratory grade
Application – pH testing (6.0-7.6 range), acid-base titration endpoint detection
Product Overview
Bromothymol blue indicator paper is a highly sensitive pH detection tool designed for laboratory and educational applications requiring precise acid-base analysis. This indicator paper utilizes bromothymol blue dye, which undergoes a distinct color transition from yellow (pH 7.6) through a green intermediate at neutral pH (7.0), providing clear visual differentiation across the critical 6.0-7.6 pH range. The paper strips are manufactured with a non-bleeding cellulose base that ensures crisp color development without dye migration, allowing for accurate spot testing on surfaces or in solutions. Each book contains perforated strips for easy dispensing, with the paper treated to maintain stability under standard laboratory conditions. The indicator responds rapidly to pH changes, typically showing color development within 1-2 seconds of contact with the test sample. This particular formulation is optimized for qualitative analysis rather than quantitative measurement, making it ideal for quick pH assessments where approximate values are sufficient. The paper maintains its sensitivity even with minimal sample volumes, requiring only a single drop for reliable color change. Storage stability is enhanced through protective packaging that shields the strips from atmospheric moisture and CO₂, which could prematurely alter the indicator’s baseline color.
FAQs
1. What is the exact pH range where bromothymol blue indicator paper shows color transition?
The color transition occurs between pH 6.0 (yellow) through pH 7.0 (green) to pH 7.6 (blue), with the most noticeable change happening in this narrow range.
2. Can this indicator paper be used for testing gaseous samples?
While primarily designed for liquid samples, the paper can detect acidic or basic gases when the strip is briefly exposed to the gas stream, though response time may be slower than with liquids.
3. How should I store unused indicator paper to maintain its accuracy?
Store the unopened books in a cool, dry place away from direct sunlight and volatile chemicals. Once opened, reseal the book tightly after each use to prevent exposure to atmospheric CO₂ and humidity.
4. What alternatives exist if I need to test pH outside the 6.0-7.6 range?
For broader pH ranges, consider universal indicator paper (pH 1-14) or specific indicators like methyl orange (pH 3.1-4.4) or phenolphthalein (pH 8.3-10.0) depending on your target range.
5. Does the color change reverse if the paper dries after testing?
The color change is permanent once the reaction occurs, though the intensity may fade slightly as the paper dries. For accurate interpretation, read results while the paper is still moist.
