Questions: Acetic acid and water react to form hydronium cation and acetate anion, like this: HCH3CO2(aq) + H2O(l) → H3O+(aq) + CH3CO2-(aq) Imagine 249 mmol of HCH3CO2 are removed from a flask containing a mixture of HCH3CO2, H2O, H3O+ and CH3CO2- at equilibrium, and then answer the following questions. What is the rate of the forward reaction before any HCH3CO2 has been removed from the flask? - Zero. - Greater than zero, but less than the rate of the reverse reaction. - Greater than zero, and equal to the rate of the reverse reaction. - Greater than zero, and greater than the rate of the reverse reaction. What is the rate of the forward reaction just after the HCH3CO2 has been removed from the flask? - Zero. - Greater than zero, but less than the rate of the reverse reaction. - Greater than zero, and equal to the rate of the reverse reaction. - Greater than zero, and greater than the rate of the reverse reaction. What is the rate of the forward reaction when the system has again reached equilibrium? - Zero. - Greater than zero, but less than the rate of the reverse reaction. - Greater than zero, and equal to the rate of the reverse reaction. - Greater than zero, and greater than the rate of the reverse reaction. How much less HCH3CO2 is in the flask when the system has again reached equilibrium? - None. - Some, but less than 249 mmol. - 249 mmol. - More than 249 mmol.

Transcript text: Acetic acid and water react to form hydronium cation and acetate anion, like this: \[ \mathrm{HCH}_{3} \mathrm{CO}_{2}(a q)+\mathrm{H}_{2} \mathrm{O}(l) \rightarrow \mathrm{H}_{3} \mathrm{O}^{+}(a q)+\mathrm{CH}_{3} \mathrm{CO}_{2}^{-}(a q) \] Imagine 249. mmol of $\mathrm{HCH}_{3} \mathrm{CO}_{2}$ are removed from a flask containing a mixture of $\mathrm{HCH}_{3} \mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}, \mathrm{H}_{3} \mathrm{O}^{+}$and $\mathrm{CH}_{3} \mathrm{CO}_{2}^{-}$at equilibrium, and then answer the following questions. \begin{tabular}{|c|c|} \hline What is the rate of the forward reaction before any $\mathrm{HCH}_{3} \mathrm{CO}_{2}$ has been removed from the flask? & Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction. \\ \hline What is the rate of the forward reaction just after the $\mathrm{HCH}_{3} \mathrm{CO}_{2}$ has been removed from the flask? & Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction. \\ \hline What is the rate of the forward reaction when the system has again reached equilibrium? & Zero. Greater than zero, but less than the rate of the reverse reaction. Greater than zero, and equal to the rate of the reverse reaction. Greater than zero, and greater than the rate of the reverse reaction. \\ \hline How much less $\mathrm{HCH}_{3} \mathrm{CO}_{2}$ is in the flask when the system has again reached equilibrium? & None. Some, but less than 249. mmol. 249. mmol. More than 249. mmol. \\ \hline \end{tabular}