Description
Specifications Table
Product Name – Congo red indicator powder Indicator
Quantity/Pack Size – 5 g
Form – Powder
Grade – Laboratory Grade
Application – pH indicator, acid-base titrations
Product Overview
Congo red indicator powder is a synthetic azo dye widely used as a pH-sensitive indicator in laboratory settings. This water-soluble powder exhibits a distinct color transition from red to blue across the pH range of 3.0 to 5.0, making it highly effective for visual endpoint detection in acid-base titrations. Its high purity ensures reliable and consistent results, minimizing interference in sensitive experiments. The powder form allows for easy preparation of indicator solutions by dissolving in water or alcohol, depending on the application requirements. Congo red is particularly valued for its stability and resistance to degradation under typical laboratory conditions, ensuring long shelf life when stored properly. As a versatile indicator, it is compatible with various titration methods and can be used in both qualitative and quantitative analyses. The compound’s molecular structure contributes to its selectivity, providing clear visual differentiation even in complex sample matrices. For optimal performance, it is recommended to prepare fresh indicator solutions and store the powder in a cool, dry place away from direct sunlight.
FAQs
1. What is the pH range for Congo red indicator powder?
Congo red indicator powder transitions from red to blue between pH 3.0 and 5.0, making it suitable for detecting acidic conditions.
2. Can Congo red be used in non-aqueous titrations?
Yes, Congo red can be dissolved in alcohol for non-aqueous titrations, though its color change may vary slightly compared to aqueous solutions.
3. How should Congo red indicator powder be stored for long-term use?
Store the powder in an airtight container in a cool, dry place, protected from moisture and direct sunlight to maintain its stability.
4. Is Congo red compatible with automated titration systems?
While primarily used for manual titrations, Congo red can be adapted for automated systems if the color change is detectable by the instrument’s sensors.
5. What are the alternatives to Congo red for pH indication?
Alternatives include methyl orange (pH 3.1–4.4) and bromophenol blue (pH 3.0–4.6), though their color transitions differ slightly from Congo red.
