Potassium hydrogen phetalate

Potassium Hydrogen Phthalate is a high-purity, crystalline inorganic salt used as a primary standard in titrations and pH calibration in analytical and pharmaceutical laboratories, providing accurate and reproducible acidic equivalents.

🏭⚗️ Production
Potassium Hydrogen Phthalate is produced by neutralizing phthalic acid with potassium hydroxide to form the monopotassium salt, followed by crystallization, drying, and packaging under moisture-controlled conditions. The crystalline product is then sealed in airtight, moisture-resistant containers to maintain chemical stability and prevent hydration or contamination.

🔬 Properties
Potassium Hydrogen Phthalate (C₈H₅KO₄) is a white, odorless crystalline solid with a molar mass of 204.22 g/mol. The compound decomposes at approximately 295–300 °C. Its solubility in water at 20 °C is about 80 g/L and it is slightly soluble in alcohol. A 0.05 M aqueous solution has a pH value around 4.00 at 25 °C.

🧪 Applications
Potassium Hydrogen Phthalate is widely used as a primary standard for acid-base titrations because of its high purity, stability, and predictable stoichiometry. It is also used for calibrating pH meters and electrodes, and as a buffer reference standard in analytical and pharmaceutical laboratories where a certified acidic salt is required.

⚠️ Safety
Potassium Hydrogen Phthalate is generally considered to have low hazard classification, but it can cause irritation to the skin, eyes, and respiratory tract if dust is inhaled. Handling should be done with suitable personal protective equipment such as gloves, goggles, and lab coat. Store the substance in a tightly-sealed container in a cool, dry, well-ventilated place away from strong oxidizing agents. Disposal should follow institutional chemical waste guidelines.