Product Overview

Potassium Hydrogen Phthalate 99.5% Extra Pure (CAS No. 877-24-7) is the monopotassium salt of phthalic acid and retains one titratable acidic proton on the aromatic dicarboxylate system. Its reproducible acid–base behaviour and formation of mildly acidic aqueous solutions have made potassium hydrogen phthalate important in fundamental pH, buffer and acid–base chemistry.

The Extra Pure grade is appropriate for general laboratory reagent preparation, buffer studies and acid–base investigations that do not require a certified reference material. A specially prepared high-purity potassium hydrogen phthalate is used in reference pH and acidimetric work.

Typical Applications

• Preparation and study of weakly acidic phthalate buffer systems.
• General acid–base equilibrium and titration experiments.
• Preparation of laboratory phthalate reagent solutions.
• Solution-chemistry studies involving aromatic hydrogen phthalates.
• Educational and research investigations of buffer capacity and pH behaviour.
• Preparation of potassium hydrogen phthalate solutions for routine laboratory method development.

Common Synonyms

• Potassium acid phthalate
• Potassium biphthalate
• Hydrogen potassium phthalate
• Potassium hydrogen benzene-1,2-dicarboxylate
• KHP

Storage Conditions

Store tightly closed in a dry, clean environment and protect from contamination during repeated use. Maintain clean handling conditions to preserve reagent composition and acid–base behaviour.