Potassium phthalate monobasic
SIGMA/60359 - BioUltra, ≥99.5% (T)
Synonym: KHP; Phthalic acid monopotassium salt; Potassium biphthalate; Potassium hydrogen phthalate
CAS Number: 877-24-7
Empirical Formula (Hill Notation): C8H5KO4
Molecular Weight: 204.22
EC Number: 212-889-4
MDL Number: MFCD00013070
Linear Formula: HOOCC6H4COOK
Product Type: Chemical
| absorption | cut-off at 309 nm in H2O at 0.1 M |
| anion traces | chloride (Cl-): ≤20 mg/kg |
| sulfate (SO42-): ≤50 mg/kg | |
| assay | ≥99.5% (T) |
| cation traces | Al: ≤5 mg/kg |
| As: ≤0.1 mg/kg | |
| Ba: ≤5 mg/kg | |
| Bi: ≤5 mg/kg | |
| Ca: ≤10 mg/kg | |
| Cd: ≤5 mg/kg | |
| Co: ≤5 mg/kg | |
| Cr: ≤5 mg/kg | |
| Cu: ≤5 mg/kg | |
| Fe: ≤5 mg/kg | |
| Li: ≤5 mg/kg | |
| Mg: ≤5 mg/kg | |
| Mn: ≤5 mg/kg | |
| Mo: ≤5 mg/kg | |
| Na: ≤100 mg/kg | |
| Ni: ≤5 mg/kg | |
| Pb: ≤5 mg/kg | |
| Sr: ≤5 mg/kg | |
| Zn: ≤5 mg/kg | |
| form | powder or crystals |
| impurities | insoluble matter, passes filter test |
| InChI | 1S/C8H6O4.K/c9-7(10)5-3-1 |
| InChI key | IWZKICVEHNUQTL-UHFFFAOYSA |
| loss | ≤0.05% loss on drying, 110 °C |
| mp | 295-300 °C (dec.) (lit.) |
| pH | 3.5-5.0 (25 °C, 0.1 M in H2O) |
| product line | BioUltra |
| Quality Level | 200  |
| SMILES string | [K+].OC(=O)c1ccccc1C([O-] |
| solubility | H2O: 0.1 M at 20 °C, clear, colorless |
| Application: | Potassium hydrogen phthalate may be used as a buffering agent or as a standard for total organic carbon (TOC) calibration and may be used to asses the oxidating activity of CNTs/TiO(2) photoanodes. Potassium hydrogen phthalate solution may be used as a liquid filter to reduce the effects of Rayleigh scattering on collected Raman spectra. |
| RIDADR | NONH for all modes of transport |
| WGK Germany | WGK 3 |
| Flash Point(F) | 387.1 °F - Pensky-Martens c |
| Flash Point(C) | 197.3 °C - Pensky-Martens c |
| Purity | ≥99.5% (T) |
| mp | 295-300 °C (dec.) (lit.) |
| UNSPSC | 12161700 |