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Potassium acid phthalate (KHP) is a monopotassium salt derived from phthalic acid. It is solid, air-stable, non-hygroscopic, and retains a stable pH while in solution. KHP is used as a standard for various chemistry purposes and as a buffering agent component.
Potassium Acid Phthalate, ACS Reagent, Primary Standard (Potassium Hydrogen Phthalate), ACS, for general laboratory use. Manufactured in ISO 9001 facility.