Potassium Hydrogen Phthalate ER Qualigens, 500g

• Primary Standard: Highly stable, non-hygroscopic (does not easily absorb moisture), and easy to dry, making it ideal for standardizing Sodium Hydroxide (NaOH) solutions.
• pH Calibration: Used to calibrate and qualify pH meters and electrodes, as it yields highly stable, standard pH solutions.
• COD Standard: Widely used to create standard solutions for Chemical Oxygen Demand (COD) tests in wastewater analysis.
• Appearance & Purity: White crystalline powder with a typical purity of 99.95% - 100.05% (on a dried basis)
• Technical Specifications
  • Formula: CHKO
  • Molecular Weight: 204.22 g/mol
  • Grade: ER (Extra Pure) / ACS
  • Solubility: Soluble in water (25 g/L at 20C), forming a colorless solution.

Q: How should Potassium Hydrogen Phthalate ER Qualigens be used in laboratory applications?

A: Potassium Hydrogen Phthalate ER Qualigens functions primarily as a standard for calibrating pH meters and conducting acid-base titrations. Measure and weigh the required amount accurately, dissolve it in distilled water, and use the prepared solution as needed in your laboratory protocols.

Q: What is the significance of its ER (Extra Pure) grade?

A: The ER (Extra Pure) grade ensures that the chemical meets stringent purity and quality standards, making it suitable for critical analytical procedures where accuracy and consistency are vital. This enhances reliability in experimental and quality control results.

Q: When should I replace my Potassium Hydrogen Phthalate stock?

A: The product has a notable shelf life of 60 months when stored properly. Replace or review your stock after this period or if the compound shows any signs of contamination, discoloration, or unusual odor to ensure experimental integrity.

Q: Where should Potassium Hydrogen Phthalate ER be stored?

A: Store the chemical in a tightly sealed plastic bottle, in a cool, dry location away from direct sunlight, heat sources, or incompatible substances to preserve its stability and purity over its shelf life.

Q: What are the benefits of using Potassium Hydrogen Phthalate as a calibration standard?

A: Its well-defined purity (99.5%) and stable chemical properties allow consistent and repeatable results in pH calibration and titration processes, ensuring accuracy in laboratory measurements and supporting reliable analytical outcomes.

Q: Can Potassium Hydrogen Phthalate ER Qualigens be used for all types of pH meter calibration?

A: Yes, due to its stable pH value (typically around 4.0-5.0) and primary standard status, it is commonly used as a reference standard for calibrating pH meters, especially in the acidic range. For other pH ranges, suitable alternative buffers should be used.