Description
Specifications Table
Product Name – BROMOCRESOL PURPLE INDICATOR AR
Quantity/Pack Size – 5 g, 25 g
Form – Powder
Grade – AR (Analytical Reagent)
Application – pH indicator (5.2-6.8 range), titrations, colorimetric assays
Product Overview
Bromocresol Purple Indicator AR is a high-purity, analytical-grade pH indicator designed for precise colorimetric applications in laboratory settings. This synthetic dye exhibits a distinct color transition from yellow to purple across the pH range of 5.2 to 6.8, making it an essential tool for accurate acid-base titrations and buffer solutions. The AR-grade certification ensures minimal impurities, guaranteeing consistent and reliable results in sensitive experiments. Its water-soluble nature allows for easy preparation of indicator solutions, while its stability under standard lab conditions ensures long-term usability without degradation. The powder form provides flexibility in concentration adjustments, catering to various experimental requirements. As a versatile indicator, it maintains its efficacy across a wide temperature range, though optimal performance is observed at room temperature. The chemical’s molecular structure, featuring bromine and sulfonate groups, contributes to its selective pH responsiveness and solubility profile. This indicator is particularly valued in quantitative analysis where precise endpoint detection is critical, offering sharp visual contrast that minimizes subjective interpretation errors.
FAQs
1. What is the exact pH range where Bromocresol Purple changes color?
Bromocresol Purple transitions from yellow to purple between pH 5.2 and 6.8, with the most noticeable change occurring around pH 6.0 where it appears green as an intermediate color.
2. Can this indicator be used in non-aqueous solvents?
The indicator is primarily designed for aqueous solutions. While it may dissolve in some polar organic solvents, the color transition range and intensity can vary significantly, potentially affecting accuracy.
3. How should Bromocresol Purple solution be prepared for lab use?
Dissolve 0.1 g of the powder in 100 mL of distilled water or ethanol (20% aqueous solution) for a standard indicator solution. For stronger color intensity, increase concentration to 0.2 g per 100 mL.
4. What factors can affect the indicator’s color change accuracy?
Temperature fluctuations, presence of metal ions, high salt concentrations, and exposure to direct sunlight can all influence the color transition point and intensity of Bromocresol Purple.
5. Is this AR-grade indicator suitable for spectrophotometric analysis?
Yes, the AR grade’s high purity makes it appropriate for spectrophotometric applications where consistent absorbance values are required, though you may need to prepare a more concentrated solution for detectable readings.
