名稱：0.5%酚酞指示液 Phenolphthalein indicator solution
保存：常溫陰涼干燥保存
規(guī)格：100mL | 500mL

酚酞作為一種常用指示劑,廣泛使用于酸堿滴定過程中。通常情況下酚酞遇酸溶液不變色,遇中性溶液也不變色，遇堿溶液變紅色。然而,酚酞在強(qiáng)堿中由紅色迅速退為無色,而在濃酸中也會(huì)變色,在稀酸溶液中酚酞滴加過量造成沉淀,使溶液變成白色渾濁。（這是由于酒精易溶于水，使試劑中難溶于水的酚酞析出的緣故。)

Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to class of dyes known as phthalein dyes.