The equilibrium NH3(aq) + H2O(l) ↔NH4+(aq) + OH−(aq) at 25 °C is subjected to a temperature jump which slightly increases the concentration of NH4+(aq) and OH−(aq).The measured relaxation time is 7.61 ns.The equilibrium constant for the system is 1.78 × 10−5 at 25 °C, and the equilibrium concentration of NH3(aq) is 0.15 mol dm−3.(a) Calculate the rate constant for the forward step.kf = _____________. Just value in 3 sig. fig., normal or exponential format, e.g. type in 1.16E6 meaning 1.16 x 106, must use capital E here. Choose a unit in the next question, must be in one of those.

Given: NH3 (aq) + H2O (l) ↔NH4+(aq) + OH-(aq) Temperature (T) =25 °CRelaxation time (t)=7.61 nsEquilibrium constant (Keq)=1.78*10-5Equilibrium concentration of aqueous NH3 (Ceq)=0.15 moldm3 It is required to find rate constant for the forward step (kf)=?Since order of the reaction is not given and most of the decomposition reactions are zero order. Assuming the order of the given reaction is zero order Rate=-dCAdt=kfAt equilibrium⇒kf=Ceqt=0.15 moldm37.16*10-9 s (1ns=10-9 s)⇒kf=20.9*106 moldm3.sTherefore the rate constant for the forward step is 20.9E6 moldm3.s meaning 20.9*106moldm3.s

Answered: The equilibrium NH3(aq) + H2O(l)…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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The equilibrium NH₃(aq) + H₂O(l) ↔NH₄⁺(aq) + OH⁻(aq) at 25 °C is subjected to a temperature jump which slightly increases the concentration of NH₄⁺(aq) and OH⁻(aq).

The measured relaxation time is 7.61 ns.

The equilibrium constant for the system is 1.78 × 10⁻⁵ at 25 °C, and the equilibrium concentration of NH₃(aq) is 0.15 mol dm⁻³.

(a) Calculate the rate constant for the forward step.

k_f = _____________. Just value in 3 sig. fig., normal or exponential format, e.g. type in 1.16E6 meaning 1.16 x 10⁶, must use capital E here. Choose a unit in the next question, must be in one of those.

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