Description
Specifications Table
Product Name – Potassium biphthalate ULTREX® II Ultrapure reagent
Quantity/Pack Size – 25 g
Form – Crystalline powder
Grade – ULTREX® II (Ultrapure, ACS Reagent Grade)
Application – pH meter calibration, acid-base titration, primary standard
Product Overview
Potassium biphthalate ULTREX® II Ultrapure reagent is a high-purity crystalline compound specifically formulated for demanding laboratory applications requiring precise standardization. As a primary pH standard, it offers exceptional stability and reproducibility, making it indispensable for calibrating pH meters and validating titration procedures. The ULTREX® II grade ensures ultra-low trace metal impurities (typically <0.5 ppm for most metals) and meets or exceeds ACS reagent specifications, guaranteeing reliable results in analytical workflows. Its non-hygroscopic nature eliminates moisture absorption concerns during storage, while the consistent molecular weight (204.22 g/mol) allows for accurate molar concentration calculations. The reagent's high solubility in water (up to 3% at 25°C) facilitates easy preparation of standard solutions without requiring excessive heating or specialized solvents. Each batch undergoes rigorous quality control testing for assay purity (≥99.95%), loss on drying (<0.05%), and residual acidity/alkalinity to ensure compliance with international pharmacopeia standards. The 25g pack size provides sufficient quantity for routine laboratory use while maintaining cost efficiency for research facilities and educational institutions.
FAQs
1. What is the shelf life of ULTREX® II potassium biphthalate when stored properly?
The reagent maintains its certified purity for at least 3 years from the date of manufacture when stored in its original sealed container at room temperature (15-25°C) away from direct sunlight and moisture sources. The non-hygroscopic properties help preserve its stability over extended periods.
2. Can this potassium biphthalate be used for preparing NIST-traceable pH buffers?
Yes, the ULTREX® II grade meets the purity requirements for preparing NIST-traceable pH 4.01 buffer solutions when combined with properly calibrated equipment and deionized water. The certified assay value allows for precise buffer preparation without additional purification steps.
3. What are the key differences between ULTREX® II and standard ACS grade potassium biphthalate?
The ULTREX® II grade undergoes additional purification processes to achieve lower trace metal contamination (typically 5-10x purer than standard ACS grade) and tighter specifications for residual moisture and particle size distribution. This results in improved solution clarity and reduced interference in sensitive analytical techniques.
4. Is this product compatible with automatic titrators and potentiometric systems?
The reagent’s high purity and consistent dissolution characteristics make it fully compatible with modern automatic titrators and potentiometric systems. Its stable pH response and minimal ionic interference ensure accurate endpoint detection in both manual and automated titration procedures.
5. What safety precautions should be observed when handling this chemical?
While generally considered non-hazardous, standard laboratory practices should be followed: wear appropriate PPE (gloves, safety glasses), work in a well-ventilated area, and avoid inhalation of dust. In case of skin contact, rinse thoroughly with water. The material is not classified as dangerous goods for transportation purposes.
