Indicator A substance used to test for acidity or alkalinity of a solution by a color change.
Indicator A substance used to test for acidity or alkalinity of a solution by a color change.
指示剂：是一种用颜色的变化来表示溶液中酸碱程度的物质。
Indicator A substance used to test for acidity or alkalinity of a solution by a color change.
指示剂：是一种用颜色的变化来表示溶液中酸碱程度的物质。