POTASSIUM HYDROGEN PHTHALATE (C005B-083610)

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.

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.

Molecular Weight: 204.22. Empirical Formula: C₈H₅KO₄. linearFormula: HOOCC₆H₄COOK. grade: puriss. p.a.. Quality Level: 200. Assay: ≥. 99.5% (T). form: solid. pH: 4. mp: 295-300 . °C (dec.) (lit.). anion traces: chloride (Cl^-): ≤. 20 . mg/kg, sulfate (SO₄^2-): ≤. 50 . mg/kg. 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. 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. 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. Personal Protective Equipment: Eyeshields, Gloves, type N95 (US).