1. Lecture 213/15/06 Environmental Club Meeting  Today at 5:30  Laska classroom 317

2. 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

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

6. 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

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

9. 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 10077.93 After the equivalence point 15012.3

11. ½ Equivalence point (NaOH titrating HF) X-axis Y-axis

12. 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) 501.473.16 equivalence point 10077.93 After the equivalence point 15012.3

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

15. 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) 501.473.16 equivalence point 10077.93 After the equivalence point 15012.3

18. Titration of a polyprotic acid http://www.creative-chemistry.org.uk/alevel/module4/documents/N-ch4-05.pdf

19. Sample (100 mL – 0.1 M) Titrant (0.2 M) Initial pH pH at equivalence point pH at 2X equivalence point X-axis at equivalence point Strong acid Strong base Weak acid Strong base Strong acid Weak base Strong acid Give examples of: Strong acid Strong base Weak acid Weak base

20. Give the identity and concentration of the titrated sample (50 mL) represented by the blue line. KbKb Hydroperoxi de 4.2 x 10 -3 Ammonia1.8 x 10 -5 Hypochlorit e 2.86 x 10 -7 Pyridine1.5 x 10 -9 Aniline4 x 10 -10