NIST84L

Potassium hydrogen phthalate

NIST^® SRM^® 84l

• Synonym(s): Potassium phthalate monobasic, KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate
• Linear Formula: HOOCC₆H₄COOK
• CAS Number: 877-24-7
• Molecular Weight: 204.22
• Beilstein/REAXYS Number: 3637128
• MDL number: MFCD00013070
• UNSPSC Code: 41116107
• PubChem Substance ID: 329818774
• NACRES: NA.24

Properties

• grade: certified reference material
• Quality Level: 100
• agency: suitable for SM 2310; suitable for SM 2320
• packaging: pkg of 60 g
• manufacturer/tradename: NIST^®
• technique(s): titration: suitable
• mp: 295-300 °C (dec.) (lit.)
• format: matrix material
• SMILES string: [K+].OC(=O)c1ccccc1C([O-])=O
• InChI: 1S/C8H6O4.K/c9-7(10)5-3-1-2-4-6(5)8(11)12;/h1-4H,(H,9,10)(H,11,12);/q;+1/p-1
• InChI key: IWZKICVEHNUQTL-UHFFFAOYSA-M

Description

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

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

Other Notes

Certified for the analytes listed below.
Potassium Hydrogen Phthalate

See certificate for values and more details at nist.gov/SRM.

Legal Information

NIST is a registered trademark of National Institute of Standards and Technology

SRM is a registered trademark of National Institute of Standards and Technology

Safety Information

• Storage Class: 13 - Non Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: 387.1 °F - Pensky-Martens closed cup
• flash_point_c: 197.3 °C - Pensky-Martens closed cup