Wodoroftalan potasu, drugorzędowy materiał referencyjny (wzorzec wtórny) do miareczkowania, w odniesieniu do SRM z NIST, Titrasure® – SCHARLAU

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PRODUCENT: SCHARLAB

Potassium hydrogen phthalate, secondary

– 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.