uestion 26 of 28 Map d Carbon dioxide dissolves in water to form carbonic add. E

Question

uestion 26 of 28 Map d Carbon dioxide dissolves in water to form carbonic add. Estimate the thermodynamic equilibrium constant for this reaction using the AG" values in the table. Substance kJ/mol H2COs(aq)-616.1 HO co g) 237.1 -394.4 Carbonic acid then ionizes in water (Ka 4.5x 107) Ignoring Ka2. estimate K for the overall process by which CO2 and H,O form H' and Hcos Ignoring Ka2, estimate K for the overall process by which CO2 Number What is the pressure of CO2 in equilibrium with carbonated water at 25 and pH-478? Number atm Exit Check Answer 0 Next

Explanation / Answer

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Reaction to form Carbonic Acid

H2O(l) + CO2(g) -------------------- H2CO3(aq)

Delta G = -616.1 + 237.1 + 394.9 = 15.4 kJ/mol

15400 = -(8.314)(298) lnK

-6.215 = ln(K)

K = e^(-6.215) = 1.94 * 10^(-3)

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