phenolphthalein

In science class, we added phenolphthalein to see if the liquid was acidic or basic.

在科学课上，我们加入酚酞来观察液体是酸性还是碱性。

The teacher showed us how phenolphthalein turns pink in a basic solution.

老师向我们展示了酚酞在碱性溶液中如何变成粉红色。

I remember using phenolphthalein in a simple experiment at school.

我记得在学校的一个简单实验中使用过酚酞。

In analytical chemistry, phenolphthalein is employed as a pH indicator for titrations due to its distinct color change.

在分析化学中，酚酞因其明显的颜色变化而被用作滴定中的pH指示剂。

The research paper discusses the sensitivity of phenolphthalein in detecting alkaline substances in environmental samples.

这篇研究论文讨论了酚酞在检测环境样品中碱性物质时的灵敏度。

During the quality control process, technicians use phenolphthalein to verify the neutrality of pharmaceutical solutions.

在质量控制过程中，技术人员使用酚酞来验证药物溶液的中性。