The ionization constant Ka of the indicator chlorophenol redis 1.0x10^-6. The color of the nonionized form of the indicator(HIn) is yellow and that pf the ionized form (In-) is red. What isthe color of the indicator in a solution whose pH is 8.oo? [Yousmust show a calculation that provides evidence of the color youstate] The ionization constant Ka of the indicator chlorophenol redis 1.0x10^-6. The color of the nonionized form of the indicator(HIn) is yellow and that pf the ionized form (In-) is red. What isthe color of the indicator in a solution whose pH is 8.oo? [Yousmust show a calculation that provides evidence of the color youstate]
Explanation / Answer
We Know that : The given indicator is : HIn <-------> H+ + In- According toHenderson-Hasselbalch equation : pH = pKa + log [ In- ] / [ HIn] pH = 8.0 pKa = 6 [In- ] / [ HIn ] = 10-2 = 1 / 100 The colour change of the indicator is close to the colour changeof yellow ( pale colour ) . As it is carried out inthe acidic medium. = 1 / 100 The colour change of the indicator is close to the colour changeof yellow ( pale colour ) . As it is carried out inthe acidic medium.