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in Chemistry by (62.9k points)
Acid base indicators are either weak organic acids or weak organic bases. Indicator change colour in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenopthalein is a colour less substance in any aqueous solution with a pH less than `8.3` in between the pH range `8.3` to `10`, transaction of colour (colourless to pink) takes place and if pH of solution is greater than `10`, then solution colour is dark pin. Considering an acid indicator HIn, base `In^(-)` can be represented as :
`HIn hArr H^(+) + In^(-)`
acidic form basic form pH of solution can be computed as :
`pH = pK_(In) + "log" ([In^(-)])/([HIn])`
In general, transition of colour takes place in between the pH range `pK_(In) +-1`
The ionization constant of an indicator is `5 xx 10^(-5)` at `25^(0)C`. Its acid form is deep orange while its basic is yellow colour in aqeous solution. which of the following statement is true for this indicator
A. The work range of the indicator is `3.3` to `5.3`
B. It cannot be used in the titration of `0.1 M HCl` with `0.1 M NaOH`
C. If an acid is titrated using this indicator, at the end point colour of solution changes from yellow to orange.
D. It can be used in the titration of `CH_(3)COOH` to orange.

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by (66.0k points)
Correct Answer - A

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