Potassium hydrogen phthalate

Potassium hydrogen phthalate, often called KHP, is an acidic salt compound. It forms white powder, colourless crystals, a colourless solution, and an ionic solid, the monopotassium salt of phthalic acid. KHP is slightly acidic and often used as a primary standard for acid-base titrations because it is solid and air-stable, making it easy to weigh accurately.

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