`K_(b)` of an acid-base indicator `H` In is `10^(-9)`. The `pH` at which its `10^(-3) (M)` solution shows the colour change

Find the pH at which an acid indicator having concentration 1.0xx10^(-4)M , having dissociation of 1% shows a colour change.

During neutralisation of an acid by a base, the end point refers for the completion of reaction. The detection of end point in acid -base neutralisation is usually made by an acid-base indicator. An acid-base indicator is itself a weak acid (Phenolphthlein) or a weak base (Mrthyl orange). At about 50% ionisation which depends on the medium, the anion furnished by an indicator (acid) or cation furnished by indicator (basic) imparts its characteristic colour to solution at point. For example phenolphthalein, the dissociation is underset("Colourless")(H In hArr H^(+))+underset("Pink")(In^(-)), K_(H In)= ([H^(+)][In^(-)])/([H In]) favoured in presence of alkali and pink colour of phenolphalein ion is noticed as soon as the medium changes to alkaline nature. The end point of acid-base neutralisation not necessarily coincides with equivalent point but it is closer and closer to equivalence point. Also at equivalence point of acid-base neutralisation pH is not necessarliy equal to 7. The dissociation constant of an acid-base indicator which furnishes coloured cation is 1xx10^(-5) . The pH of solution at which indicator will furnish its colour is :

An acid base indicator (K_(a) =10^(-5)) has its pH range 4.4 - 6.0. The correct statement (s) amongst the following is/are

pH at which an acidic indicator with K_("in")=1xx10^(-5) changes colour when the indicator is 1xx10^(-3) M is

Calculate the pH at which an acid indicator with K_(a)=1xx10^(-5) change colour when the indicator cincentration is 1xx10^(-3)M . Also report the pH at which coloured ion is 80% present.

An acid indicator is represented by Hl_(n).(K_(a)=10^(-5)) . The range of change of colour for the indicator is

An acid indicator is represented by Hl_(n).(K_(a)=10^(-5)) . The range of change of colour for the indicator is