Determination Of Hydrofluoric Acid, Ammonium Fluoride, And Maleic ...

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• Determination of hydrofluoric acid, ammonium fluoride, and maleic acid in acid cleaning solutions

Determination of hydrofluoric acid, ammonium fluoride, and maleic acid in acid cleaning solutions

AN-H-115

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<p>A direct thermometric titration (TET) with 2 mol/L NaOH is used to determine the HF, NH₄F, and maleic acid (C₄H₄O₄) contents of acid cleaning solutions. Three endpoints (EPs) are obtained, which may be assigned as follows:</p><p><br />EP1: C₄H₄O₄ (pKa1 = 1.9), HF (pKa = 3.17)<br />EP2: C₄H₄O₄ (pKa2 = 6.07)<br />EP2: NH₄F (pKa = 8.2)</p><p><br />The HF content is determined by subtracting the difference (EP2-EP1) from EP1.</p>

A direct thermometric titration (TET) with 2 mol/L NaOH is used to determine the HF, NH4F, and maleic acid (C4H4O4) contents of acid cleaning solutions. Three endpoints (EPs) are obtained, which may be assigned as follows:

EP1: C4H4O4 (pKa1 = 1.9), HF (pKa = 3.17)EP2: C4H4O4 (pKa2 = 6.07)EP2: NH4F (pKa = 8.2)

The HF content is determined by subtracting the difference (EP2-EP1) from EP1.

Download AN-H-115 (EN)

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CÔNG TY TNHH METROHM VIỆT NAM

Tòa nhà Park IX, số 08 Đường Phan Đình Giót, Phường Tân Sơn Hòa Thành phố Hồ Chí Minh

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