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

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Presentation transcript:

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

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

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

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 Before the equivalence point (1/2 equiv. point) equivalence point 1007 After the equivalence point

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

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 Before the equivalence point (1/2 equiv. point) equivalence point After the equivalence point

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

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 Before the equivalence point (1/2 equiv. point) equivalence point After the equivalence point

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

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 Before the equivalence point (1/2 equiv. point) equivalence point After the equivalence point

Titration of a polyprotic acid

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

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