A solution is made of 10^-2.7 M sodium acetate and 10^-3.7 M NaHCO3.

a. Find the pH of this solution. Assume the solution is initally closed to the atmosphere.

b. This solution is then equilibrated with atmospheric CO2 where Pco2= 400ppm. Find the new pH after the system has reached equilibrium.

HAc= H+ + Ac- Ka, Ac= 10^-4.76

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