5. A 100.0 mL aliquot of 0.100 M diprotic acid H2A (pK1 = 4.00, pK2 = 8.00) was titrated with 1.00 M NaOH Highlight each stage in the titration and the equivalence point. Also, obtain the first

7. solution was observed to be 5.45, exactly halfway to its equivalent point. What is the Ka and pKa of this acid? When carrying out the titration of a weak acid with a strong base, the pH of the

Consider the titration of 50.0 mL of 0.100 M acetic acid with 0.0900 M NaOH. For acetic acid, Ka = 1.8 x 10-5. %3D a) What is the initial pH? (Be able to write the reaction responsible for the initial pH!) b) Determine whether the pH at the equivalence point is >, <, or = 7.00. (Be able to write BOTH the titration reaction & the reaction that is responsible for the pH at the equivalence point!)

What volume of stock 0.350 M KOH and what mass of N-2-Hydroxyethylpiperazine-N′-2-ethanesulfonic acid (HEPES, MW 238.30, pKa 7.56) is needed to prepare 100.0 mL 0.100 M buffer at pH 7.20?