pH Indicator Chart – Colors and Ranges

Below is a colors and ranges chart for some pH indicators. Curiously most of the indicators have similar pH range of about 1.9 pH for the change in color. The indicator with the sharpest color change is a combination of bromocresol green and methyl red requires only 0.5 pH change which is oddly much narrower than either indicator.

I am very interested metacresol purple, unfortunately it is not shown in the chart. From other sources I estimate it requires a change of about 1.8ph. The log scale of pH is compressing the change relative to the change hydrogen ion concentration, meaning a change of 2 pH is a change in hydrogen ion concentration of 100.



PS: Looking at the chart again cresol purple may be meta-cresol purple.
Source for the chart is https://sciencenotes.org/ph-indicator-chart-colors-and-range...



[Edited on 2/28/2022 by wg48temp9]