1. Lecture 172/28/07 LECTURE TONIGHT

2. Titration Curve Why do you use one? Equivalence point vs. Endpoint pH vs. acid/base added

5. Building a titration curve via calculations 4 Regions (to build one from calculations):  1) initial pH  2) before equivalence point  3) at equivalence point  4) after equivalence point

6. Building a titration curve via calculations Comparison of a titration of a strong acid vs. a weak acid Regionx-axis (mL of acid/base) 0.1 M NaOH y-axis (pH) 100 mL of 0.1 M HCl y-axis (pH) 100 mL of 0.1 M HF Initial pH Before the equivalence point (1/2 equiv. point) equivalence point After the equivalence point

7. Initial pH (NaOH titrating HCl) X-axis: Y-axis:

8. Building a titration curve via calculations Comparison of a titration of a strong acid vs. a weak acid Regionx-axis (mL of acid/base) 0.1 M NaOH y-axis (pH) 100 mL of 0.1 M HCl y-axis (pH) 100 mL of 0.1 M HF Initial pH 01 Before the equivalence point (1/2 equiv. point) equivalence point After the equivalence point

10. Equivalence point (NaOH titrating HCl) X-axis Y-axis

11. Building a titration curve via calculations Comparison of a titration of a strong acid vs. a weak acid Regionx-axis (mL of acid/base) 0.1 M NaOH y-axis (pH) 100 mL of 0.1 M HCl y-axis (pH) 100 mL of 0.1 M HF Initial pH 01 Before the equivalence point (1/2 equiv. point) equivalence point 1007 After the equivalence point

13. ½ Equivalence point (NaOH titrating HCl) X-axis Y-axis

14. Building a titration curve via calculations Comparison of a titration of a strong acid vs. a weak acid Regionx-axis (mL of acid/base) 0.1 M NaOH y-axis (pH) 100 mL of 0.1 M HCl y-axis (pH) 100 mL of 0.1 M HF Initial pH 01 Before the equivalence point (1/2 equiv. point) 501.47 equivalence point 1007 After the equivalence point

16. After Equivalence point (NaOH titrating HCl) X-axis Y-axis

17. Building a titration curve via calculations Comparison of a titration of a strong acid vs. a weak acid Regionx-axis (mL of acid/base) 0.1 M NaOH y-axis (pH) 100 mL of 0.1 M HCl y-axis (pH) 100 mL of 0.1 M HF Initial pH 01 Before the equivalence point (1/2 equiv. point) 501.47 equivalence point 1007 After the equivalence point 15012.3

20. Initial pH (0.1 M NaOH titrating 0.1 M HF) K a = 6.8 x 10 -4 X-axis: Y-axis:

21. Building a titration curve via calculations Comparison of a titration of a strong acid vs. a weak acid Region x-axis (mL of acid/base) 0.1 M NaOH y-axis (pH) 100 mL of 0.1 M HCl y-axis (pH) 100 mL of 0.1 M HF Initial pH 012.10 Before the equivalence point (1/2 equiv. point) 501.47 equivalence point 1007 After the equivalence point 15012.3

23. Equivalence point (NaOH titrating HF) X-axis Y-axis