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1．指示剂与中和反应在中和反应的溶液中加入指示剂,是指示中和反应进行程度的常用方法．往滴有酚酞溶液的NaOH溶液中滴加稀盐酸时,应边滴加边振荡,当溶液刚好由红色变为无色时,即为该反应的终点．例1在实验室用15 mL NaOH溶液和稀盐酸进行中和反应实验．
1. Indicators and Neutralization Reactions The addition of an indicator to a neutralization reaction is a common method of indicating the degree of neutralization reaction. When adding dilute hydrochloric acid dropwise to the NaOH solution containing phenolphthalein solution, it should be shaken while dripping. When the solution just turns from red to colorless, it is the end of the reaction. Example 1 Neutralization experiment was conducted in the laboratory with 15 mL NaOH solution and dilute hydrochloric acid.