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Calculate the total carbonate in a solution in equilibrium with atmospheric CO2 at 350 ppm (a) at pH 7.0; (b) at pH 9.0 condition. (KH = 3.4´10-2 Mol L-1 atm-1 for CO2; For H2CO3 = H+ + HCO3-, Ka1 = 4.2´10-7 Mol L-1 at 25°C; For HCO3- = H+ + CO32-, Ka2 = 4.8´10-11 Mol L-1 at 25°C)