Q.

For any weak acid, indicator HIn ionising as

HInH++In

colour of the unionised form (HIn) is observed when

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a

In[HIn]=110

b

pH=pKa1

c

Both (a) and (b)

d

None of the above

answer is C.

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Detailed Solution

HInH++In

pH=pKa+logIn[HIn]

When colour of unionised form is seen.

In[HIn]=110

 pH=pKa1

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