Carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodyna

Question

Carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constant for this reaction using the deltaG values

K=_____________

Carbonic acid then ionizes in water (Ka1=4.5x10-7). Ignoring Ka2, estimate K for the overall process by which CO2 and H2O form H+ and HCO3-.

K=_____________

What is the pressure of CO2 in equilibrium with carbonated water at 25C and pH = 4.87?

PCO2 = __________ atm

HINT: The first step of the process is the reaction of CO2(g) with H2O(l) to form H2CO3(aq). The second step of the process is the first ionization of H2CO3(aq). It may help to write out each step, and the overall reaction.

Explanation / Answer

1) The reaction is H2O + CO2 ---H2CO3

?Go = delt a G (products) - delta G of reactants

                = -616.1

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