Phenolphthalein

C20H14O4, 98%, CAS : 77-09-8

Phenolphthalein is a commonly used chemical in secondary school science studies, particularly in chemistry experiments. It is an acid-base indicator that changes color based on the pH of a solution. Phenolphthalein transitions from colorless in acidic solutions to pink in basic solutions. This property makes it ideal for acid-base titrations and pH determination experiments. Students can observe and interpret the color changes to determine the endpoint of a titration or the pH of a solution. Phenolphthalein's simplicity and effectiveness as a pH indicator make it a valuable tool for teaching acid-base concepts in secondary school education, aiding students' understanding of pH and acid-base reactions.

酚酞是中學科學研究中常用的化學物質，特別是化學實驗中。 它是一種酸鹼指示劑，會根據溶液的 pH 值改變顏色。 酚酞在酸性溶液中從無色轉變為鹼性溶液中的粉紅色。 這一特性使其成為酸鹼滴定和 pH 測定實驗的理想選擇。 學生可以觀察並解釋顏色變化，以確定滴定終點或溶液的 pH 值。 酚酞作為 pH 指示劑的簡單性和有效性使其成為中學教育中酸鹼概念教學的寶貴工具，幫助學生了解 pH 和酸鹼反應。