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One ecologically important equilibrium is that between carbonate and hydrogencarbonate (bicarbonate) ions in natural water. (a) Th e standard Gibbs energies of formation of CO3 2?(aq) and HCO3?(aq) are ?527.81 kJ mol?1 and ?586.77 kJ mol?1, respectively. What is the standard potential of the HCO3?/CO32?,H2 couple? (b) Calculate the standard potential of a cell in which the cell reaction is Na2CO3(aq) + H2O(l) ? NaHCO3(aq) + NaOH(aq). (c) Write the Nernst equation for the cell, (d) Predict and calculate the change in potential when the pH is changed to 7.0. (e) Calculate the value of pKa for HCO3?(aq).

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