Follow-up: Can titration be used for analysis? A: No, potentiometric titration and indicator titration are unacceptable. Q: Brother, can you give me a detailed determination method? Answer: I study chemistry, but I don't have any books at hand. I don't have time to check the molecular weight of Na2SO4 and barium chloride, but this method is classic. The book Determination of Content by Gravimetry should be found in the first volume of College Chemistry and Inorganic Chemistry. Accurately weigh about 0. 1000 g sodium sulfate sample, dissolve it with 10ml purified water, heat it to boiling, and drive off all carbon dioxide. With constant stirring, inject 10% barium chloride 15Inl at one time. Keep the temperature on the electric heating plate for half an hour and let it stand for 3 ~ 4 hours (or overnight 1. Filter with slow quantitative filter paper, wash the precipitate in a beaker with warm water for two or three times, then transfer it all to the filter paper, clean the beaker, wash it with 1% hydrochloric acid for three times, continue to wash the precipitate and filter paper with warm water until there are no chloride ions, and move the precipitate into a weighed porcelain crucible, and incinerate it at 800~C for half an hour at low temperature.