Influences of Some Indicator to the Titration Errors in Acid and Alkali Titration Experiment

In the traditional acid and alkali titration experiment with methyl orange as indicator,titration end-point is difficult to be judged,especially for beginners.This paper use methyl red-bromocresol green mixed indicator instead of methyl orange,the end point's is from green to wine red, contrast intensity,acuteness identify with the naked eye,the experiment result's relative standard deviation less than 3%,the titration error is little.,the result is satisfaction,can generalize exercise.This paper discussed the influence of the different indicator and it's different dosage to the titration error in the acid and alkali titration experiment too.