Chemistry - Ionic Equilibrium Question with Solution | TestHub
ChemistryIonic EquilibriumTheory of Indicators / Double indicatorMedium2 minQB
ChemistryMediumsingle choice
Best indicator to detect end point in complete titration of 20 mL of 0.1 M against 0.2 M HCl is - [For : = 4 × ; = 5 × ]
Options:
Answer:
C
Solution:
Complete titration needs 2 × 2 mmol = 4 mmol HCl = 20 mL of 0.2 M HCl. The end point solution is 2 mmol in 40 mL = 0.05 M.
pH = ½( - log C) = ½(6.4 + 1.3) = 3.85.
The indicator with pKin closest to this pH is methyl orange (3.7).
Answer: (C).
Stream:JEESubject:ChemistryTopic:Ionic EquilibriumSubtopic:Theory of Indicators / Double indicator
⏱ 2mℹ️ Source: QB
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