Potassium hydrogen phthalate

Common card · No. 278552

Potassium hydrogen phthalate, often called simply KHP, is an acidic salt compound. It is the monopotassium salt of phthalic acid which forms a white powder, colorless crystals, and a colorless aqueous solution. KHP is slightly acidic, and it is often used as a primary standard for acid–base titrations because it is solid and air-stable, making it easy to weigh accurately. It is not hygroscopic. It is also used as a primary standard for calibrating pH meters because, besides the properties just mentioned, its pH in solution is very stable. It also serves as a thermal standard in thermogravimetric analysis. KHP dissociates completely in water, giving the potassium cation (K+) and hydrogen phthalate anion (HP−) KHP → H 2...

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