Chemistry - Redox Reactions Question with Solution | TestHub
ChemistryRedox ReactionsDouble IndicatorMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
A volume of 50 ml of solution containing 1 g each of Na₂CO₃, NaHCO₃ and NaOH was treated with N-HCl.
What will be the titre reading if only phenolphthalein is used as an indicator?
Options:
Answer:
C
Solution:
mmol: NaOH = 1000/40 = 25, Na₂CO₃ = 1000/106 = 9.43, NaHCO₃ = 1000/84 = 11.9. Phenolphthalein neutralizes all OH⁻ plus half the carbonate (to HCO₃⁻); NaHCO₃ does not react. mmol HCl = 25 + 9.43 = 34.43, so titre = 34.4 ml of 1 N HCl, matching (c).
Stream:JEESubject:ChemistryTopic:Redox ReactionsSubtopic:Double Indicator
⏱ 2mℹ️ Source: QB
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