High Purity Phenolphthalein Indicator Solution
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Product Code : SCL-CA-12677
Quick Answer: The High Purity Phenolphthalein Indicator Solution is a prepared acid-base indicator that stays colourless in acidic and near-neutral solutions and turns pink as the solution becomes alkaline, marking endpoints in suitable titrations.
Last updated: October 2026
Key Features
- Indicator compound phenolphthalein, formula C20H14O4
- Colourless-to-pink change in its alkaline transition range
- Commonly cited transition range of about pH 8.2 to 9.8
- Ready-prepared liquid for controlled dropwise addition
- Used for alkali detection and for comparing indicator ranges
Technical Specifications
| Specification | Value |
|---|---|
| Indicator compound | Phenolphthalein |
| Chemical formula | C20H14O4 |
| Colour transition | Colourless to pink |
| Transition range | Approximately pH 8.2 to 9.8 |
About This Product
Only the number of drops given in the method is added to the test solution, and the flask is swirled continuously as the endpoint approaches. The first persistent pale-pink colour marks the endpoint where the method requires it. Keeping the quantity small avoids excess indicator distorting the result.
Frequently Asked Questions
Q1. Why is phenolphthalein supplied as a solution?
A prepared solution can be added drop by drop straight away, without first dissolving the solid indicator, which helps control the amount used.
Related: Chemical Analysis, Methyl Orange Analytical Reagent.
For a quotation on the High Purity Phenolphthalein Indicator Solution, contact School Equipments India.
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