Carbonic acid (H2CO3) is a diprotic weak acid with the following Ka values:

Carbonic acid (H2CO3) is a diprotic weak acid with the following Ka values:
Ka1 = 4.5 x 10-7
Ka2 = 4.7 x 10-11.
Calculate the pH of a solution that is prepared by adding 4.3 x 10-2 moles of NaHCO3 and 9.6 x 10-3 moles of Na2CO3 to a 1.00L volumetric flask and diluting it to the mark with water.