The titration of \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) with \(\mathrm{HCl}\) has the following qualitative profile:

a. Identify the major species in solution as points A-F.
b. For the titration of \(25.00 \mathrm{~mL}\) of \(0.100 \mathrm{M} \mathrm{Na}_{2} \mathrm{CO}_{3}\) with \(0.100 \mathrm{M} \mathrm{HCl}\), calculate the \(\mathrm{pH}\) at points A-E. (B and D are halfway points to equivalence.)

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pH A B V D V/ mL HCI E F