SEQUESTRATION BY ALKALINE SOLUTIONS: A common approach to capturing CO_2(g) is t

Question

SEQUESTRATION BY ALKALINE SOLUTIONS: A common approach to capturing CO_2(g) is to dissolve it in aqueous solutions of strong bases. The overall reaction that takes place is shown: CO_2(g) + 2 OH^- (aq) CO_3^2- (aq) + H_2 O(I) Delta H_rxn = -109 kJ/mol Delta S_rxn = - 186 J/(K mol) The following table lists kinetic data for [CO_2] as a function of time (in milliseconds, ms) at 25 degree C in a solution with a constant [OH^-] = 0.15 M. t At what temperatures can we expect the rate constant for the forward reaction to be smaller than the rate constant for the backward reaction? T > 586 K T

Explanation / Answer

At no temperatue this is possible, because once the carbonate anion is formed it will not goback to CO2. This statement is valid whatever the temperature is.

It is possible that carbonate salt may as silid may decompose to CO2, but not in solution form.

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