Bromothymol blue ( ) is yellow in its protonated form and blue in its deprotonated form
CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases
Problem
Bromothymol blue (pKa=7.1) is yellow in its protonated form and blue in its deprotonated form. Over which pH range will a sample of bromothymol blue most likely appear green (an approximately equal mixture of yellow and blue)?
(a) pH 7–9
(b) pH 5–7
(c) pH 6–8
(d) pH 5–6