In the form of a water solution or as litmus paper, it is the oldest and most-used indicator of whether a substance is an acid or a Base.
它的水溶液，或者做成石蕊纸后，是最古老和最常用的指示剂，可以指示一种物质是酸还是碱。
A white or pale yellow crystalline powder, C20H 14o 4, used as an acid-base indicator, in making dyes, and in medicine as a laxative.
一种白色或淡黄色的晶体粉末，C20 H14o4，用作酸性指示剂，用于制染料，并在医学上用作一种轻泻剂。
Discussed a reason discoloration range of acid-base indicator function reason in a text book, pointed out some discoloration reason problems in the book.
探讨了一本教材中关于酸碱指示剂作用原理的理论变色范围探讨，指出了该教材在理论变色范围推论中存在的问题。
The fuzzy character of colour of the acid base indicator alizarin yellow R is studied in the paper.
研究了酸碱指示剂茜素黄R颜色的模糊特性。
A white or pale yellow crystalline powder, C20H14O4, used as an acid-base indicator, in making dyes, and in medicine as a laxative.
苯酚酞一种白色或淡黄色的晶体粉末，c20h14o4，用作酸性指示。
A white or pale yellow crystalline powder, C20H14O4, used as an acid-base indicator, in making dyes, and in medicine as a laxative.
苯酚酞一种白色或淡黄色的晶体粉末，c20h14o4，用作酸性指示。
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