Unit Plan on Acids and Bases

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Unit Plan

On

Acids & Bases

May 25, 2006

Table of Contents

I. General ObjectivesPage 3

II. Learning OutcomesPage 4

III. Assessment, Grading & Resources Page 5

IV. Tending to different Learning stylesPage 7

V. SchedulePage 8

VI. Appendix 1 Page 20

Acids and bases

Unit plan
Grade 12

General Objectives:

▪ Introduce pH, acid and base definition
▪ Discuss acid, base, strong acid, weak acid, aqueous, neutral, pH definitions. ▪ Introduce Kw the ion product of water.
▪ Introduce Kw the ion product of water
▪ Explain through Kw why solutions with pH less than 7 are acidic and why those with pH greater than 7 are basic. ▪ Define volumetric analysis, titration, standard solution, equivalence point and End point, primary standard, secondary standard, all in PowerPoint presentation.. ▪ Define the experiment’s purpose: 1 - To study the important technique of acid, base titration. 2 - Determine the concentration of an unknown monoprotic acid. ▪ Explain how to calculate pH of a strong acid, a strong base, weak acid, and weak base. ▪ Discuss the experiment and its results.

▪ Discuss possible errors random and systematic errors ▪ Distinguish between precision and accuracy.
▪ Give guidelines for writing the Lab report
▪ Explain the sections of a Lab report: the abstract, introduction, procedure, discussion, conclusion, and references ▪ Explain reaction between a strong acid and a strong base. ▪ State the ionic equation for this reaction

▪ Describe the shape of the titration curve for reactions of strong acid and strong base, weak acid and strong base, strong acid and weak base. ▪ Model solving strong acid, strong base problems.

▪ Explain how to calculate pH before, at and after equivalence in a strong acid strong base titration, weak acid strong base titration and vice versa. ▪ Introducing weak acid, base application in real life. ▪ Define degree of dissociation

▪ Give examples of conjugate acid/base pair
▪ Introduce Ka, and pka
▪ Show that dilution favors the dissociation of weak acid or weak base ▪ Model calculating pH of a weak acid or weak base
▪ Explain relation between pH and pKa
▪ Model using the gamma rule to predict the direction of the conjugate acid, base reaction. ▪ Model studying pH change of a titration between weak acid /strong base and vice versa. ▪ Define a buffer

▪ Model how to solve buffer problems
▪ Give students the choice to choose between three projects; acid rain, testing acidity for shampoos, and household products and Buffer project Learning outcomes:

• Work in cooperative groups
• Use the internet to retrieve information
• Define acids and bases according to all 3 definitions (Arrhenius, Lowry- Bronsted, Lewis). • Distinguish acids and bases by their properties.
• Detect acids and bases using different pH indicators. • Distinguish between strong acids and weak acids/ strong bases and weak bases. • List some major strong acids, and strong bases.

• Calculate pH of a strong acid /pH of strong base/ pH of a weak acid/ pH of a weak base. • Use Kw and Ka to calculate concentration of OH- and H+ • Follow directions of an acid/base experiment

• Work safely in a Laboratory
• Write a Lab report
• Define titration, volumetric analysis, primary standard, and secondary standard, end point, and equivalence point. • Reflect on accuracy and precision of experimental results • Work safely in a Laboratory

• Use Laboratory equipment
• Prepare a solution
• Calculate pH of a solution before, at and after equivalence in a strong acid strong base titration, weak acid strong base titration and vice versa. • Describe the shape of the titration curve in a strong base strong acid...
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