engleski

Direct Potentiometric Determination of Fluoride Species by Using Ion-Selective Fluoride Electrode

A novel approach and method for potentiometric determination of acid dissociation constant (Ka) of hydrofluoric acid are described. Proposed method is based on using commercial fluoride ISE (FISE) as very inexpensive, simple and reasonably fast method for determination of fluoride species. We are proposing a usage a direct potentiometric method for determination of fluoride species and Ka of hydrofluoric acid in water solutions for 1.01 ≤ pH ≤ 7.01 and 1.0×10−1 ≤ cT(F−) ≤ 1.0×10−6 mol L−1. Found acid dissociation constant of hydrofluoric acid (pKa = 3.24±0.02, Ka = 5.75×10−4 L mol−1) and formation constant of HF2− (log = 0.600,  = 3.98 L mol−1) are in very good agreement with literature ones.

luoride; potentiometric; determination; ion-selective electrode

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