COMPARISON OF TWO METHODS OF TITRATION CALIBRATIONRESULTS OF HYDROCHLORIC ACID STANDARD SOLUTION

Use automatic potentiometric titration and manual titration separately to calibrate hydrochloric acid standard solution, compare the result, in order to confirm the difference of calibrating results between the two kinds of methods. The method adopts the automatic potentiometric titration and calibrating method of hydrochloric acid standard solution provided by GB/T 601 -2002 and GB/T 5009.1 -2003, with anhydrous sodium carbonate for primary standard substance to calibrate the concentration of hydrochloric acid. Using two kinds of method to calibrate high concentration and low concentration hydrochloric acid solution, the results indicate there are no apparent differences. Furthermore, automatic potentiometric titration shows remarkable advantage than manual titration in calibrating high concentration of hydrochloric acid by comparing the standard deviation and relative standard deviation of the results of two methods.