1. Dr. Nielsen finds an old bottle of nitric acid (HNO3) in the stockroom. The label is very faded, but she thinks it says that the concentration of the nitric acid is 9.780 M. Since acids of unknown molarity
are
not useful for experiments, Dr. Nielsen decides to titrate the nitric acid with barium hydroxide
(Ba(OH)2) to determine the actual concentration of the acid.

2HNO3 (aq) + Ba(OH)2 (aq) → H20 (l) + Ba(NO3)2 (aq)

a. Dr. Nielsen uses 25.00 mL of HNO3 in the titration. If the actual concentration of the HNO3 is
9.780 M, what volume (in mL) of 5.062 M Ba(OH)2 would be required to completely react with
the HNO3?
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b. Dr. Nielsen finds that 10.20 mL of 5.062 M Ba(OH)2 are required to completely react with the
HNO3. If Dr. Nielsen used 25.00 mL of HNO3 in the titration, what is the actual concentration of
the HNO3?