Potassium hydrogen phthalate, secondary standard for volumetric titrations, Titrasure®

- Synonyms: Potassium biphthalate, Phthalic acid monopotassium salt, KHP
- C8H5KO4
- M = 204,22 g/mol
- CAS [877-24-7]
- EINECS-No.: 212-889-4
- Solub. in water: (20 ºC): 80 g/l
- Melting point: 295 - 300 ºC
- LD 50 (oral, rat): > 3200 mg/kg
- Tariff number: 2917 39 80 80
- Applications: analytical chemistry, titrant in volumetric analysis (bases), in buffer solutions.

SPECIFICATIONS
assay (acidimetric, on dried sample): 99,95 - 100,05 %
identity (IR-spectrum): passes test
insoluble in water: max. 0,005 %
pH (0,05 mol/l, H2O, 25 °C): 4,00 - 4,02
chlorine compounds (as Cl): max. 0,003 %
chlorides (Cl): max. 0,002 %
total nitrogen (as N): max. 0,001 %
heavy metals (as Pb): max. 5 ppm
iron (Fe): max. 5 ppm
sodium (Na): max. 0,005 %
sulphur compounds (as S): max. 0,002 %

This standard solution is traceable to Standard Reference Material from NIST.