在人民教育出版社化学室编著的全日制普通高级中学教科书化学第一册《钠的化合物》一节中,安排了这样一个实验:把水滴入盛有 Na_2O_2固体的试管中,立即用带火星的木条放在试管口,检验生成的气体。在教学活动中,许多教师为了说明产物中除了有 O_2生成外,还有NaOH 生成,就向反应液中滴加酚酞溶液,产生的现象却是溶液变为红色后很快褪色。是什么原因使红色褪去呢?关于这一现象的解释有很多,在各类化学期刊上也有相 In the section “Sodium Compounds” in the first full-time normal high school textbook chemistry book edited by the People’s Education Press Chemical Office, an experiment was arranged to drop water into a test tube containing Na 2 O 2 solids, immediately using Mars’s A wooden strip is placed in the mouth of the tube and the generated gas is examined. During the instructional activities, many teachers used the phenolphthalein solution in addition to the production of NaOH in addition to the production of O 2 . The resulting phenomenon was that the solution quickly faded after it became red. What are the reasons for the red to fade? There are many explanations for this phenomenon, and there are also phases in various chemical journals.