C. When a strong acid titrant (e.g. HCl) is added to a weak base (B2-) capable of accepting two protons, the following reactions occur: (vi) B2-(aq) + H+(aq) -> HB-(aq) (vii) HB-(aq) + H+(aq) -> H2B(aq) Note: single arrow to the right rather than double arrow means the reactions go to completion 11. Which region/point (A,B,C,D,E, or F) is where the titration begins and B2- is the predominant species in solution ? ____________ 12. Which reaction (vi or vii) dominates at higher pH values? _____________ 13. Halfway through which region (A,B,C,D,E, or F) is where the pH = pKa2 ? ____________ 14. Which species (H2B, HB-, or B2-) predominates at "C", the equivalence point 1 ? _____________ 15. During the titration, which region (A,B,C,D,E or F) on the curve represents the first buffer region for the base? _____________ ? Second buffer region _____________ ?
C. When a strong acid titrant (e.g. HCl) is added to a weak base (B2-) capable of accepting two protons, the following reactions occur:
(vi) B2-(aq) + H+(aq) -> HB-(aq)
(vii) HB-(aq) + H+(aq) -> H2B(aq)
Note: single arrow to the right rather than double arrow means the reactions go to completion
11. Which region/point (A,B,C,D,E, or F) is where the titration begins and B2- is the predominant species in solution ? ____________
12. Which reaction (vi or vii) dominates at higher pH values? _____________
13. Halfway through which region (A,B,C,D,E, or F) is where the pH = pKa2 ? ____________
14. Which species (H2B, HB-, or B2-) predominates at "C", the equivalence point 1 ? _____________
15. During the titration, which region (A,B,C,D,E or F) on the curve represents the first buffer region for the base? _____________ ? Second buffer region _____________ ?
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