1.02400

Potassium hydrogen phthalate

Volumetric standard, secondary reference material for alkalimetry, traceable to NIST Standard Reference Material (SRM) Certipur^® Reag. Ph Eur

• Synonym(s): Potassium hydrogen phthalate
• Empirical Formula (Hill Notation): C₈H₅KO₄
• CAS Number: 877-24-7
• Molecular Weight: 204.22
• MDL number: MFCD00013070
• UNSPSC Code: 41116107
• EC Index Number: 212-889-4
• NACRES: NA.24

Properties

• Agency: ISO 17025; reag. Ph. Eur.
• Quality Level: 300
• form: solid
• potency: >3200 mg/kg LD₅₀, oral (Rat)
• technique(s): titration: suitable
• pH: 4.0 (20 °C, 50 g/L in H₂O)
• mp: 295-300 °C
• solubility: 80 g/L
• density: 1.636 g/cm³
• bulk density: 900 kg/m³
• storage temp.: 15-25°C
• SMILES string: [K+].[O-]C(=O)c1c(cccc1)C(=O)[O-].[H+]
• 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

Potassium hydrogen phthalate, also known as KHP, is a volumetric standard manufactured under stringent conditions and measured with the highest possible precision. Its mass fraction is determined by potentiometric titration, and it is qualified in a DIN EN ISO/IEC 17025 accredited laboratory.

Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.

Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.

Application

It finds its use as a certified reference material (CRM) for the standardization of volumetric solutions in alkalimetric titrations, according to Ph. Eur. It is also used to prepare a standard solution in determination of COD.

Features and Benefits

• Available as a solid in a secure glass bottle to ensure its stability for the entire shelf life until opened.
• Certified reference material according to ISO 17034
• High-purity material traceable to NIST SRMs
• Qualified in a DIN EN ISO/IEC 17025 accredited laboratory
• In accordance with the chapter reagents of Ph. Eur
• High-quality offering accurate titer determinations
• Accompanied by a certificate of analysis (CoA)

Packaging

SKU-pack size numbers ending with a "3" are SmartChemicals with an RFID tag on the label for seamless data transfer to the instrument, e.g. xxxxxx1003 or xxxxxxx 4003. More information on www.sigmaaldrich.com/SmartChemicals

Legal Information

CERTIPUR is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 1
• Flash Point(F): 387.1 °F - Pensky-Martens closed cup
• Flash Point(C): 197.3 °C - Pensky-Martens closed cup