Potassium hydrogen phthalate
SIAL/NIST84L - NIST® SRM® 84l
Synonym: Potassium phthalate monobasic; KHP; Phthalic acid monopotassium salt; Potassium biphthalate; Potassium hydrogen phthalate
CAS Number: 877-24-7
Empirical Formula (Hill Notation): C8H5KO4
Molecular Weight: 204.22
MDL Number: MFCD00013070
Linear Formula: HOOCC6H4COOK
Product Type: Chemical
| agency | suitable for SM 2310 |
| suitable for SM 2320 | |
| format | matrix material |
| grade | certified reference material |
| InChI | 1S/C8H6O4.K/c9-7(10)5-3-1 |
| InChI key | IWZKICVEHNUQTL-UHFFFAOYSA |
| manufacturer/tradename | NIST® |
| mp | 295-300 °C (dec.) (lit.) |
| packaging | pkg of 60 g |
| Quality Level | 100  |
| SMILES string | [K+].OC(=O)c1ccccc1C([O-] |
| technique(s) | titration: suitable |
| Application: | This Standard Reference Material (SRM) is intended for use as an acidimetric primary standard. This SRM is certified for acidimetric assay ONLY and is not intendedfor use as a pH standard. |
| Features and Benefits: | • A unit of SRM 84L is supplied as crystalline material in a 60 g unit • Information on product description, disposal, and transportation is available in the accompanying MSDS • The enclosed CoA contains information on the SRM’s expiry date and instructions for its handling, storage, and use |
| General description: | It consists of highly purified potassium hydrogen phthalate (KHP), KHC8H4O4. Its certified value is calculated as the mass fraction of total acid (replaceable H+) expressed as KHP. Its certified value is based on the results of coulometric assays of ground and dried material. The assay value for this material was obtained by automated coulometric titration to the inflection point (pH ≈ 8.4) of weighed test portions of KHP. The certified value represents the result of 30 titrations of test portions taken from 16 bottles selected by stratified random sampling. The certification of SRM 84L is valid, within the measurement uncertainties specified, provided the RM is handled and stored in accordance with the instructions given in the “Instructions for Storage and Use”. SRM 84L_CERT  SRM 84L_SDS |
| Legal Information: | NIST is a registered trademark of National Institute of Standards and Technology |
| Legal Information: | SRM is a registered trademark of National Institute of Standards and Technology |
| Other Notes: | Certified for the analytes listed below. Potassium Hydrogen Phthalate See certificate for values and more details at nist.gov/SRM. |
| 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 |
| mp | 295-300 °C (dec.) (lit.) |
| UNSPSC | 41116107 |