NAU CHM 320 - Acid-Base Titrations (5 pages)

Previewing pages 1, 2 of 5 page document View the full content.
View Full Document

Acid-Base Titrations



Previewing pages 1, 2 of actual document.

View the full content.
View Full Document
View Full Document

Acid-Base Titrations

48 views


Pages:
5
School:
Northern Arizona University
Course:
Chm 320 - Analytical Chemistry

Unformatted text preview:

Chapter 12 Acid Base Titrations Homework Due Friday March 17 Problems 12 3 12 6 12 8 12 12 12 15 1219 12 23 12 37 12 40 12 42 12 48 12 54 12 56 CHM 320 Lecture 19 Chap 12 Titration of Acids Bases Allows for the determination of the quantities of the acidic and basic components present in a mixture Allows for the determination of the Ka s Provides some information about buffer capacities Use the equations from Chapters 10 and 11 to construct titration curves CHM 320 Lecture 19 Chap 12 Regions of the Titration Curve a Monoprotic Acid Region 1 Region 2 Region 3 Region 4 Initial point no base added Before equivalence point buffer region Equivalence point After equivalence point excess base Titration Curve weak acid titrated by strong base 14 12 10 3 2 8 4 pH 1 6 4 2 0 0 5 10 15 20 volume NaOH mL CHM 320 Lecture 19 Chap 12 25 30 35 Determining pH of Different Regions of the Titration Curve a Monoprotic Weak Acid The first step is to determine the volume of base needed to reach the equivalence point Use the concentration and volume of acid Region 1 Initial point no base added The pH is determined from the concentration of the weak acid x2 F x Ka x H Region 2 Before equivalence point buffer region The pH is determined using the Henderson Hasselbalch equation buffer pH pKa log base acid Region 3 Equivalence point The pH is determined from the concentration of the weak acid now converted to its conjugate base and the dilution factor Region 4 After equivalence point excess base The pH is determined from the concentration of excess OH present CHM 320 Lecture 19 Chap 12 Calculate the pH at each point for the titration of 100 0 mL of 0 100 M cocaine Kb 2 6x10 6 with 0 200 M HNO3 Va 0 0 10 0 20 0 25 0 30 0 40 0 49 9 50 0 50 1 51 0 and 60 0 mL Draw a graph of pH versus Va CHM 320 Lecture 19 Chap 12



View Full Document

Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view Acid-Base Titrations and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Acid-Base Titrations and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?