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An acidic indicator ionises as In H hArr...

An acidic indicator ionises as `I_n H hArr In^(-) + H^(+) ` . The molecular and ions of the indicator show different colours. The indicator changed it colour if its acidic of basic form completely predominate.
What is the percentage of basic form acidic indicator .` (P^(ka) =6) ` is an aqeous NaCl soluition at 25% C

A

`90 %`

B

` 80 %`

C

` 60 %`

D

` 100 %`

Text Solution

Verified by Experts

The correct Answer is:
A
` 7 =6 + log ""( [In^(-) ])/( [HIn]) rArr ([In^(-)])/([HIn]) =10`
` ([In^(-) ])/( [In^(-) ][HIn]) xx 100 =(10)/(10+1) xx 100 = 90 %`
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