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Chemistry - Chemical Kinetics Question with Solution | TestHub

ChemistryChemical KineticsFirst Order ReactionsMedium2 minQB

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Passage / Comprehension

Kinetics of acidic hydrolysis of ester is a pseudo-first-order reaction: ⟶ $C H_{3} COOC H_{3} (a q .) + H_{2} O (ℓ) (e x cess) ⟶ C H_{3} COO H (a q .) + C H_{3} O H (a q .)$ . The rate law is given by: $r = K [H^{+}] [H_{2} O] [C H_{3} COOC H_{3}]$ ; $K = 1.8 \times 1 0^{- 3} M^{- 2} se c^{- 1}$ ,

where $H^{+}$ ion concentration is given by the acid catalyst. In an experiment, $1 MC H_{3} COOC H_{3}$ is hydrolyzed using $0.1 M H Cl$ as a catalyst.

Reaction mixture is titrated against standard NaOH solution at different times. If initially 10 ml of NaOH was required while after long time 100 ml of NaOH is required then find volume of NaOH required at 230.3 sec .

Options:

Answer:

Solution:

$Kt = ln (\frac{V _{\infty} - V _{0}}{V _{\infty} - Vt})$

$1 0^{- 2} \times 230.3 = 2.303 lo g (\frac{100 - 10}{100 - V _{t}}) \Rightarrow V_{t} = 91 ml$

Stream:JEESubject:ChemistryTopic:Chemical KineticsSubtopic:First Order Reactions

⏱ 2mℹ️ Source: QB

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