In a titration of HNO3, you add a few drops of phenolphthalein indicator to 50.00 mL of acid in a flask. You quickly add 20.00

Question

In a titration of
HNO3, you add a few drops of phenolphthalein indicator to
50.00 mL of acid in a flask. You quickly add
20.00 mL of
0.0502 M
NaOH but overshoot the end point, and the solution turns deep pink. Instead of starting over, you add
30.00 mL of the acid, and the solution turns colorless. Then, it takes
3.22 mL of the
NaOH to reach the end point.
(a) What is the concentration of the HNO3 solution?
(b) How many moles of NaOH were in excess after the first addition?

Kunduz · Accepted Answer

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