acid-base indicators change colour because of changes in the（ ）ion concentration of a solution

acid-base indicators change colour because of changes in the（ ）ion concentration of a solution
acid-base indicators change colour because of changes in the（ ）ion concentration of a solution

acid-base indicators change colour because of changes in the（ ）ion concentration of a solution
Hydrogen.

酸碱指示剂颜色的变换因为溶液中氢离子浓缩