用蒸馏水或乙醇水溶液抽提试样中的水溶性酸或碱,然后用酸度计或指示剂对抽提物进行测定。
It USES distilled water and alcohol to refine water soluble acid and alkali of sample and then test the extractive with PH indicator.
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。
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.
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