Chemistry - Ionic Equilibrium Question with Solution | TestHub

ChemistryIonic EquilibriumMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasysingle choice

An acid base indicator has $K_{a} = 3 \times 1 0^{- 5}$ . The acid form of the indicator is red and the basic form is blue. By how much must the pH change in order to change the indicator from 75% red to 75% blue (log 3 $=$ 0.4770)

Options:

Answer:

Solution:

pH change $=$ pH of 75 % blue - pH of 75% red
$= [p K a + l o g l o g \frac{75}{25}] - [p K a + l o g l o g \frac{25}{75}]$
$= l o g 3 + l o g 3$
$p H = 0.954$

Stream:NTA_ABHYASSubject:ChemistryTopic:Ionic EquilibriumSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2020

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