Carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constant for this reaction using the AG; values in the table. K = K = 2.0 x10-3 Carbonic acid then ionizes in water (Kal = 4.5 x 10-7). Ignoring K?2, estimate K for the overall process by which CO? and H?O form H+ and HCO3. Pco? 9.0 x10-10 What is the pressure of CO? in equilibrium with carbonated water at 25 °C and pH = 4.54? Substance H?CO3(aq) H?O(1) CO?(g) 0.403 Incorrect AG (kJ/mol) -616.1 -237.1 -394.4 bar

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

? G_{;}

values in the table. K-. Carbonic acid then ionizes in water

(K_{a 1} = 4.5 \times 1 0^{? 7}

). Ignoring

K_{22}

, cstimate

K

for the overall process by which

CO_{2}

and

H_{2} O

form

H^{+}

and

HCO_{3}^{?}

.

?

What is the pressure of

CO_{2}

in equilibrium with carbonated water at

2 5^{?} C

and

pH = 4.54

?

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