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一、背景介绍1.知识背景:酸碱指示剂是指能跟酸或碱的溶液作用而显示不同颜色的物质。初中化学曾提到:石蕊试液和酚酞试液是最常用的两种酸碱指示剂。然而,在实际生活中,我们常常想知道某种物质的酸碱性,如土壤、唾液、菜蔬等,但又不能马上找到石蕊试液和酚酞试液,因此通过本课
I. Background 1. Background: Acid-base indicators are substances that can display different colors when they react with acids or alkalis. Junior high school chemistry has mentioned: litmus test solution and phenolphthalein test solution are the two most commonly used acid-base indicators. However, in real life, we often want to know the acidity and alkalinity of a certain substance, such as soil, saliva, vegetables, etc., but we cannot find the litmus test solution and phenolphthalein test solution immediately, so we passed this lesson.