Conditions for direct titration with NaOH: ka c >；; 10 (-8), while ka1= 5.9 *10-2ka2 = 6.45 *10-5 of oxalic acid. Obviously, oxalic acid can be titrated as long as its concentration is not too small.

Titration analysis is a kind of chemical analysis. Dropping a reagent solution with a known exact concentration into the solution of the detected substance until the chemical reaction is completed, and then obtaining the content of the detected component according to the concentration and volume of the reagent solution. This method is called titration analysis.

Accuracy comparison

The samples with high acid value were determined five times by automatic potentiometric titration and manual titration respectively. The relative standard deviation of automatic potentiometric titration is 1. 1%, and that of manual titration is 1.6%. The relative deviation of automatic potentiometric titration is 2. 1%, while the relative standard deviation of manual titration is as high as 1 1.4%, which shows that the precision of automatic potentiometric titration is better than that of manual titration.