4-Hydroxybenzoate 4-Hydroxybenzoate ion 456-23-5 Benzoic acid, 4-hydroxy-, ion(1-) Benzoic acid, p-hydroxy-, ion(1-) p-Hydroxybenzoate p-Hydroxybenzoate anion p-Hydroxybenzoic acid ion(1-) p-Hydroxybenzoic acid monoanion CAS 456-23-5

Description

4-Hydroxybenzoate 4-Hydroxybenzoate ion 456-23-5 Benzoic acid, 4-hydroxy-, ion(1-) Benzoic acid, p-hydroxy-, ion(1-) p-Hydroxybenzoate p-Hydroxybenzoate anion p-Hydroxybenzoic acid ion(1-) p-Hydroxybenzoic acid monoanion (CAS 456-23-5), molecular formula C7H5O3 and molecular weight 137.11 g/mol, is a CATO reference standard with documented purity and traceability.

4-Hydroxybenzoate 4-Hydroxybenzoate ion 456-23-5 Benzoic acid, 4-hydroxy-, ion(1-) Benzoic acid, p-hydroxy-, ion(1-) p-Hydroxybenzoate p-Hydroxybenzoate anion p-Hydroxybenzoic acid ion(1-) p-Hydroxybenzoic acid monoanion (C7H5O3) contains a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

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