A solution contains equal concentrations of bromocresol green (yellow protonated

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A solution contains equal concentrations of bromocresol green (yellow protonated, blue deprotonated;

pK_a=4.8

) and phenolphthalein (colorless protonated, pink deprotonated;

pK_a=9.3

). Predict the observable color at each of the following pH values: 5.0, 8.0, and 11.0. List the color expected at each pH.