And what the indicator does, it reacts with the H plus ions in the following way. When there is a lot of H plus ions associated in our solution, aka, when it's acidic, that means equilibrium will shift this way. Now, when there is very little H plus ions or our concentration of H plus ion is very low, equilibrium will shift this way. Meaning we're going to have more of the conjugate base of our conjugate acid. Note that this represents one color and this represents a different color. So in solution, when this guy predominates, our solution will be of this color.