Potassium Hydrogen Phthalate 99.5% – Foil Pouch


Potassium hydrogen phthalate, often called simply KHP, is an acidic salt compound. It forms white powder, colourless crystals, a colourless solution, and an ionic solid that is the monopotassium salt of phthalic acid. 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.

  • Primary Standard: Used for accurate titration in chemistry.
  • Calibration Standard: Ensures instrument accuracy.
  • pH Buffer: Creates solutions with known pH values.
  • Titration Indicator: Some applications as an endpoint indicator.
  • Standardization of NaOH: Used to standardize sodium hydroxide solutions.
  • Quality Control: Ensures acidity standards in industries.
  • Education: Commonly used in chemistry teaching.
  • Research: Vital in various research applications.
  • Laboratory Reagent: Versatile for chemical analysis.
  • Drying Agent: Can remove moisture from solvents.

Minimum Assay: <99.5%
Molecular Formula: C8H5KO4
Molecular Weight: 204.22
Solubility in water (% weight): 80 g/L @ 20 C
Melting Point: 295-300°C
Density (g/cm3): 1.64
Insoluble matter: 0.003%
Loss on drying at 110 C: 0.2%
Chloride (Cl): 0.0015%
Phthalic acid: <0.005%
Sulphate (SO4): 0.003%
Copper (Cu): <0.0004%
Iron (Fe): <0.0005%
Sodium (Na): <0.0099%

Hazard Phrases: Not considered harmful under normal laboratory conditions

Cas No: 877-24-7
Einecs No: 212-889-4


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