Published by:
CGP EDU Academic Team
Published on: August 14, 2026
An acid-base indicator has a K a of 3.0 × 10 –5 . The acid form of the indicator is red and the basic form is blue. Then -
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(a, b)
HIn 
In – + H + Red blue
pH = p
K In + log 
pH = (5–log 3) + log 
= 4.05
pH = p K In + log 
= 5 – log 3 + log 3 = 5
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