Pre-Laboratory AssignmentThe Chemistry of Acids and BasesName ___________________________________________1. Write the balanced, net ionic equation for the ionization of acetic acid, CH3CO2H, in aqueous solu-tion.2. If Kafor acetic acid is 1.8 x 10-5, what is the value of pKa? ________________3. What is the predicted pH of a 0.10 M solution of acetic acid?4. The value of Kafor the ammonium ion, NH4+, is 5.6 x 10-10. Which is the stronger acid, acetic acidor ammonium ion? Explain briefly5. On the back of this sheet is the titration curve for the organic acid benzoic acid. That is, we have titrat-ed 50 mL of 0.050 M benzoic acid with 0.05 M NaOH. The plot shows how the pH changes as NaOHis added (and the acid is consumed).a) What is the original pH of the acid solution? ___________________b) What is the pH at the equivalence point? ________________ Explain why this value is greater than7.c) What is the value of pKafor benzoic acid? (See the experimental write-up, page 6, to learn how tofind this from a titration curve.) Explain how you arrived at your value.Is benzoic acid a stronger or weaker acid than acetic acid? _____________________Chemistry 112 Laboratory: Acid-Base Chemistry—Prelab Page 41Chemistry 112 Laboratory: Acid-Base Chemistry—Prelab Page
View Full Document
Unlocking...