手持技术探究酚酞的配制

Study on Preparation of Phenolphthalein by Hand-held Technology

酚酞是中学常用的酸碱指示剂,酚酞的配制方法对酸碱中和滴定终点的指示有一定的影响,造成系统误差。为了探究酚酞指示剂配制的最佳配比,用盐酸滴定NaOH溶液,选用不同配制方法配制的酚酞作为指示剂,利用pH传感器实时采集混合溶液的pH,对比找出终点pH偏离7的百分比较小的一组,说明此方法配制的酚酞对滴定终点造成的系统误差最小。

Phenolphthalein is a common PH indicator in senior high school,the method of preparation of phenolphthalein has a certain effect on the instructions at the end of the Acid–base titration,resulting in a system error.In order to study the optimum preparation of phenolphthalein indicator,sodium hydroxide solution was titrated with hydrochloric acid,and phenolphthalein prepared by different preparation methods was used as the indicator,and the pH of mixed solution was collected by pH sensor,the results show that the system error of phenolphthalein produced by this method is the least of the system error caused by this method.