Thymol blue is yellow in its protonated form and blue in its deprotonated form
CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Thymol blue is yellow in its protonated form and blue in its deprotonated form. The indicator has a pKa of 2.0 for its first transition. A sample solution has a measured pH of 1.3. Predict the indicator’s color in this solution and briefly justify your prediction.