Determination of sulfuric acid, hydrofluoric acid, and ammonium bifluoride in acid mixtures
AN-H-109
pt_BR
<p>Results from three separate single endpoint titrations are used to calculate the results. The mixture of H<sub>2</sub>SO<sub>4</sub>, HF, and NH<sub>4</sub>F/HF contains H<sup>+</sup> from H<sub>2</sub>SO<sub>4</sub>, HF, and NH<sub>4</sub>F/HF, SO<sub>4</sub><sup>2-</sup> from H<sub>2</sub>SO<sub>4</sub>, and F<sup>-</sup> from HF and NH<sub>4</sub>F/HF. Analysis of total H<sup>+</sup> («total acids») by NaOH titration, F<sup>-</sup> by titrating with Al(NO<sub>3</sub>)<sub>3</sub> («total fluoride») and SO<sub>4</sub><sup>2-</sup> by titrating with BaCl<sub>2</sub> provides the information required to determine the composition of the mixture.</p>
Results from three separate single endpoint titrations are used to calculate the results. The mixture of H2SO4, HF, and NH4F/HF contains H+ from H2SO4, HF, and NH4F/HF, SO42- from H2SO4, and F- from HF and NH4F/HF. Analysis of total H+ («total acids») by NaOH titration, F- by titrating with Al(NO3)3 («total fluoride») and SO42- by titrating with BaCl2 provides the information required to determine the composition of the mixture.