1.

Calculatethe pH at whichan acidindicator with K_(a)= 1xx 10^(5) changescolourwhenindicator concentrationis 1 xx 10^(-3)M . Alsorport the pH at whichcoloured ionsare 80 %present.

Answer»

SOLUTION :Forindicatordissociation equilibrium
`HlnhArr H^(+)+In^(-)`
ColourAColour B
` K_(In) = ([H^(+)][In^(-)])/([HLN]) `
`rArr1 xx 10^(-5) = ([H^(+)]xx 80//100)/(20//100)`
` :.[ H^(+)] = 0.25 xx 10^(-5)`
`:. PH = 5.6020`


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