Potassium phthalate monobasic
SIAL/60360 - puriss. p.a., ≥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
| anion traces | chloride (Cl-): ≤20 mg/kg |
| sulfate (SO42-): ≤50 mg/kg | |
| assay | ≥99.5% (T) |
| cation traces | Ca: ≤10 mg/kg |
| Cd: ≤5 mg/kg | |
| Co: ≤5 mg/kg | |
| Cr: ≤5 mg/kg | |
| Cu: ≤5 mg/kg | |
| Fe: ≤5 mg/kg | |
| Mg: ≤5 mg/kg | |
| Mn: ≤5 mg/kg | |
| Na: ≤100 mg/kg | |
| Ni: ≤5 mg/kg | |
| Pb: ≤5 mg/kg | |
| Zn: ≤5 mg/kg | |
| form | solid |
| functional group | carboxylic acid |
| grade | puriss. p.a. |
| InChI | 1S/C8H6O4.K/c9-7(10)5-3-1 |
| InChI key | IWZKICVEHNUQTL-UHFFFAOYSA |
| mp | 295-300 °C (dec.) (lit.) |
| pH | 4 |
| Quality Level | 200  |
| SMILES string | [K+].OC(=O)c1ccccc1C([O-] |
| solubility | water: soluble (93 g/l at 30 °C (86 °F)) |
| Application: | Potassium phthalate monobasic may be used as a primary standard in acidimetric titration and also to prepare potassium phthalate buffer solution for pH calibration. |
| General description: | Potassium phthalate monobasic (KHP) is the monopotassium salt of pthalic acid. It has been proposed as a certified reference material (CRM) under ISO/IEC 17025 and ISO Guide 34 accreditation. Its spectral shift, multiplicity, solubility and relaxation times in different solvents have been reported. |
| 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 | 12352302 |