1. As come in, The Materials: Paper, pencil, calculator, periodic table for Cumulative Quiz Paper, pencil, calculator, and yesterday’s handout for Review TURN IN THE LAB AT THE FRONT OF THE ROOM. NO LATE ASSIGNMENTS TODAY. GRADES ARE DUE TOMORROW. The Plan: Solutions Cumulative Quiz Acid/Base Review Discuss final exam review The Assessment: LAST UNIT TEST TOMORROW!!

2. ACID/BASE UNIT REVIEW

3. Properties of Acids and Bases Individually: Take a few minutes to prepare a list of at least six properties of acids. Then, make a list of at least six properties of bases. With your Partner: Compare your two lists. Did you forget anything? Did you make a mistake? Check your notes to make sure that you’ve got all of the properties straight. Worth your time? 24 points on the 100 point test

4. Define an acid. Individually: Write the Arrhenius theory of acids in your own words. Be sure to give an example to support your definition. Write the Bronsted-Lowry definition of acids. Find an example in your notes to support your definition. With your Partner: Compare your definitions and examples with your partner. Do you have any questions? Are your partner’s definitions correct? HELP ONE ANOTHER!

5. Define a base. Individually: Write the Arrhenius theory of bases in your own words. Be sure to give an example to support your definition. Write the Bronsted-Lowry definition of bases. Find an example in your notes to support your definition. With your Partner: Compare your definitions and examples with your partner. Do you have any questions? Are your partner’s definitions correct? HELP ONE ANOTHER!

6. Practice defining acids and bases. Looking at the formula Al(OH) 3, we would assume that a) this is a base b) this has a pH of 7 c) this is an acid d) the concentration is stable According to the Bronsted-Lowry model, an base is a(n) a) H+ acceptor b) proton donor c) H + ion producer d) OH - ion producer e) none of these Which represents a conjugate acid-base pair? a) H 2 O, H 3 O + b) OH -, HNO 3 c) H 2 SO 4, SO 4 2- d) HC 2 H 3 O 2, C 2 H 3 O 2 - Identify the acid, base, conjugate acid, and conjugate base. H 2 SO 4 + H 2 O --> H 3 O + + HSO 4 - NH 3 + H 2 O --> OH - + NH 4 + WORTH YOUR TIME? 16 pts on 100 pt. test

7. Differentiate between strong acid and weak acid. Individually: Read the following statement: Acids dissociate in water to form H+ ions. Some acids dissociate more readily than others. Strong acids dissociate completely to form the most H+ ions possible; while weak acids only dissociate partially. With your Partner: Where did you hear “strong acid” or “weak acid” used in this unit? Choose the correct answer: Solid hydrogen sulfate partially dissociates when added to water to produce an aqueous solution of HSO 4 - and H 3 O +. Therefore, sulfuric acid is a a) strong acid b) weak acid c) conjugate acid d) none of these

8. Understanding the K w equation Individually: Write the k w equation. Write a sentence that explains when this equation should be used. With your Partner: Check your equation. Compare your explanations of the usefulness of this equation. Worth your time? 14 pts to 30 pts on 100 pt test

9. Understanding the pH equation Individually: Write the pH equation. Write a sentence that explains when this equation should be used. Fill in the blanks: The pH scale goes from ___ to ____. Acids have a pH _____ 7, and bases have a pH ____ 7. With your Partner: Check your equation. Compare your explanations and answers to the fill in the blank statement. Worth your time? 21 pts on 100 pt test

10. Understanding the pOH equation Individually: Write the pOH equation. Write a sentence that explains when this equation should be used. How is the pOH equation different from the pH equation? With your Partner: Check your equation. Compare your explanations. Worth your time? 16 pts on 100 pt test

11. Understanding the relationship between pH and pOH Individually: Write the equation that includes both pH and pOH. Write a sentence that explains when this equation should be used. With your Partner: Check your equation. Compare your explanations. Worth your time? 16 pts on 100 pt test

12. Practice K w, pH, and pOH calculations. Check your answers to yesterday’s handout. Solve. During the course of the day, human saliva varies between acidic and basic. What is the [H + ] in saliva if [OH - ] is 3.16x10 -8 M? What is the pH of the saliva? At this point in the day, is it acidic, basic, or neutral? What is the concentration of OH - ions in 0.1M bicarbonate of soda if [H 3 O + ] is 3.98x10 -9 M? Is the bicarbonate acidic, basic, or neutral? What is the pH? What is the pOH? What is the concentration of H 3 O + ions in eggs if [OH - ] is 6.0x10 -7 M? Are eggs acidic, basic, or neutral? If the pH of a solution is 6.4, what is the [OH - ]? Find the [H+] and [OH-] of a solution with a pH of 3.494. For each pair of concentrations, tell which represents the more acidic solution. 1.[H + ] = 0.000013 M or [OH - ] = 0.0000032 M 2.[H + ] = 1.03x10 -6 M or [OH - ] = 1.54x10 -8 M

13. Understanding titrations Individually: Fill in the blanks. Every time that an acid and a base react in a neutralization reaction, a _____ and ______ are produced. Solve: A volume of 20-mL of 0.25M Al(OH) 3 neutralizes a 75-mL sample of H 2 SO 4 solution. What is the concentration of the acid? Solve: Calculate how many milliliters of 0.30M H 2 SO 4 must be added to titrate 75 mL of 0.10 M KOH. With your Partner: Check your fill in the blank statement. Compare your balanced equations with your partner. Compare your work and answers to the two calculations. NOTE: IF SOMEONE HAS TOLD YOU ABOUT A SHORT-CUT (M A V A = M B V B ), FORGET IT. IT DOES NOT WORK CONSISTENTLY. Worth your time? 10 pts on 100 pt test