Question

Sleeping pills often contain barbital, which is weakly acidic (pKa = 8.00). For analysis of the barbital content of a sleeping pill, a titration is carried out with strong base. It takes 12.00 mL of 0.200 M base to reach the stoichiometric point. If the initial acid concentration is 0.0120 M and the solution volume is 200. mL, what is the pH of the solution after adding the following volumes of base solution:4.4ml, 6.0ml.12.0ml, 13.3ml

Answer 1

For the 4.40 mL and 6.00 mL additions, use the Henderson-Hasselbalch equation. For the stoichiometric point, use the hydrolysis of the salt. Post your work if you get stuck.