Map deb pling Carbon dioxide dissolves in water to form carbonic acid. Estimate

Question

Map deb pling Carbon dioxide dissolves in water to form carbonic acid. Estimate the Substance AGro (kJ/mo) thermodynamic equilibrium Constant for this reaction using the AG values H2CO3(aq) -616.1 shown here -237.1 H20 Number CO2(g) -394.4 K- 002 Carbonic acid then ionizes in water (Kat 4.5x10 7). Ignoring Ka2, estimate Kfor the overall process by which CO2 and H2O form H* and HCO3 Number A 9.1 x 10 10 What is the pressure of CO2 in equilibrium with carbonated water at 25 C and pHE 4.72? Use the overall reaction to write the overall Kexpression. Number H (aq) HCOI (aq) 5.7 atm CO, Use the pH to find [H*] and [HCO3 1 (H HCO, 10 Plug in values and solve 9 x 10 for the pressure of CO2. pH HCO, 10 CO, no Previous Give Up & View Solution Try Again Next HExit

Explanation / Answer

pH = 4.72
use:
pH = -log [H+]
4.72 = -log [H+]
[H+] = 1.905*10^-5 M

H2CO3 <---> H+   + HCO3-
                             x           x
but
[H+] = 1.905*10^-5 M = x
so,
[HCO3-] =x = 1.905*10^-5 M

K = [H+] [HCO3-] /pCO2
9.1*10^-10 = (1.905*10^-5 M)*(1.905*10^-5 M) /pCO2
pCO2 = 0.40 atm
Answer: 0.40 atm

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