The `pK_("in") `so an acid -type indicator is `10.5`. For which `pH` transition range is the indicator most suitable ?

Select the correct set of the statements for an acid type indicator used in a titration : (i) In general, pH range of an indicator is (pK_(a)-1) to (pK_(a)+1) and indicator shows its characteristic colours in this range. (ii) In general pH range of an indicator is (pK_(a)-1) to (pK_(a)-1) and indicator does not show its characteristic colours in this range (iii) In this relation : pH=pK_(In) +log_(10)((["In"^(-)])/(["HIn"])),pH value representes pH of indicator solution. (iv) In this relation : pH=pK_(In) +log_(10)((["In"^(-)])/(["HIn"])),pH value represents pH of resulting solution containing indiactor .

which of the indicated 'H' is most acidic ?

At pH=2 half of the indicator thylmol blue ( an acid type indicator)is in unionised form,find the % of indicator in unionised form in the solution with [H^(+)]=4xx10^(-3)M

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 predominant. Dissociation constant of an acidic indicator is 10^(-5) . At what p^(H) 80% of the indicator exists in molecular form ?

A certain acid-base indicator is red in acid solution and blue in basic medium. At pH=5 75% of the indictor is present in the solution in its blue form. Calculate the pH at which indicator shows 90% red form ?

The K_a of an indicator HIn is 9 x 10^(-4) , The percentage of the basic form of indicator is 10x in a solution of pH = 4. What is x ?

The acid from of an acid base indicator is yellow in acid and red in basic from. What is the change in pH in order to change the indicator form 80% yellow to 80% red.

Which of halogen acids indicated below is incorrect ?

The ionisation constant of an acid base indicator (a weak acid) is 1.0 xx 10^(-6) . The ionised form of the indicator is red and unionised form is blue. The p H change required to alter the colour of indicator from 80% red to 20% red is

a. At what pH does indicator change colour if the indicator is a weak acid with K_(Ind) = 4.0 xx 10^(-4) . b. For which of the following neutralisation would the indicator be useful? i. HCl +NaOH ii. CH_(3)COOH +NaOH iii. HCl +NH_(3) c. Name the indicators which can be used for such titration.