If 40.00 mL of 0.100 M Na2CO3 is titrated with 0.100 M HCl, calculate (a) the pH at the start of the titration; (b) the volume of HCl required to reach the first equivalence point and the predominant species present at this point; (c) the volume of HCl required to reach the second equivalence point and the predominant species present at this point; (d) the pH at the second equivalence point.
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