179922

Potassium phthalate monobasic

ACS reagent, acidimetric standard

• Synonym(s): 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
• EC Number: 212-889-4
• MDL number: MFCD00013070
• UNSPSC Code: 12352100
• PubChem Substance ID: 24850834
• NACRES: NA.21

Properties

• grade: ACS reagent
• Quality Level: 200
• assay: 99.95-100.05% dry basis
• form: crystals
• quality: acidimetric standard
• impurities: ≤0.002% S compounds; ≤0.003% Cl compounds; ≤0.005% insolubles
• pH: 4.00-4.02 (25.0 °C±0.2 °C, 0.05 M)
• mp: 295-300 °C (dec.) (lit.)
• cation traces: Fe: ≤5 ppm; Na: ≤0.005%; heavy metals: ≤5 ppm (by ICP)
• 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

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.

Safety Information

• Storage Class: 13 - Non Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: 387.1 °F - Pensky-Martens closed cup
• flash_point_c: 197.3 °C - Pensky-Martens closed cup
• ppe: Eyeshields, Gloves, type N95 (US)