| 摘要 |
<p>Provided is a potentiometric titration method for a mixed acid solution. The method comprises the following steps: step one: formulating a strong base-alcohol solution with a concentration of 0.1-0.2 mol/L, and calibrating the actual concentration of the strong base-alcohol solution using a standard reagent in an autotitrator; step two: adding a first solvent and a second solvent to the mixed acid solution and stirring same to form a mixed system, and titrating to find out three equivalent points of acid concentrations in the mixed system by using the strong base-alcohol solution in the autotitrator, wherein the volumetric ratio of the first solvent to the second solvent is 8-16 : 1, with the first solvent being ethanol and the second solvent being ethylenediamine or butylamine; and step three: calculating the content of each acid in the mixed acid solution by using the equivalent points of acid concentrations obtained in step two, according to the mass conservation principle. The method can quickly and accurately test the concentration of each acid in the mixed acid solution.</p> |
