The ionization constant Ka of the indicator chlorophenol redis 1.0x10^-6. The co

Question

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.

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