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If an acidic indicator HIn ionies as HIn...

If an acidic indicator `HIn` ionies as `HInhArrH^(+)+In^(-)`. To which maximum `pH` value its solution has distinct colour characterstic of `HIn`

A

`pK_("in")-1`

B

`pK_("in")+-1`

C

`pK_("in")`

D

`7`

Text Solution

Verified by Experts

The correct Answer is:
B
For colour characteristic of `H` indicator
`pH=pK_("in")-log``([HI_(n)])/([In^(-)])`
Indicator's colour range
`pH=pK_("in")+-1`
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