1. Wednesday March 21, 2012 (Neutralization Reactions)

2. A student discovers that a solution contains many more H + ions than OH - ions, and is therefore an acid. This student id dealing with the concept of ___. One student dissolves 50 grams of sugar in 100 mL of water and another dissolves 200 grams of sugar in 100 mL of water. The difference in the two solutions would be ____________. Nitric acid ionizes completely in water, whereas formic acid ionizes incompletely. What is the main difference between the two acids? ___________

3. Assignment Currently Open Summative or Formative Date Issued Date Due Date Into Grade Book Last Day WS - Solute – Solvent Interactions F2/222/27 Molarity – Concentration of Solution F2/293/5 QUIZ – ELECTROLYTES, NON-ELECTROLYTES, & MOLARITY S3/2 3/23 What Do You Know About Acids and Bases? F3/53/8 WS – The pH ScaleF3/83/9 QUIZ – Acids, Bases, and pHS3/9 3/30 WS – Acid-Base StrengthF3/193/21

4. Announcements I will not be available this afternoon after school.

5. Neutralization Reactions There are many common examples of acidic compounds reacting with basic compounds, each neutralizing the other. – Ex) An antacid soothes an overly acidic stomach by neutralizing the stomach acid.

6. Neutralization Reactions In a neutralization reaction, the acid and the base both dissociate (or ionize) to form positively-charged cations and negatively charged anions. The H + cation of the acid and the OH - anion of the base bond to form water. The negative anion of the acid and the positive cation of the base bond to form a salt.

7. Neutralization Reactions For example, hydrochloric acid will react with the base sodium hydroxide in the following sequence of events: Hydrochloric acid ionizes: HCl æ H + + Cl - Sodium hydroxide dissociates: NaOH æ Na + + OH - The H + cation of the acid and the OH - anion of the base bond to form water: H + + OH - æ HOH The Cl- anion of the acid and the Na + cation of the base bond to form a salt: Na + + Cl - æ NaCl

8. Neutralization Reactions Sodium bicarbonate (baking soda), NaHCO 3, and tartaric acid, C 4 H 6 O 6, are two components in baking powder. When allowed to react in solution, these two compounds produce carbon dioxide. The escaping carbon dioxide causes foods, such as biscuits, to rise. Can you write the complete steps for this reaction?

9. Neutralization Reactions H 2 C 4 H 4 O 6 æ H + + C 4 H 4 O 6 - NaHCO 3 æ Na + + HCO 3 - H + + HCO 3 - æ HOH + CO 2 Na + + C 4 H 4 O 6 - æ Na 2 C 4 H 4 O 6 Complete Reaction H 2 C 4 H 4 O 6 + NaHCO 3 → Na 2 C 4 H 4 O 6 + CO 2 + H 2 O Can you balance this equation? 1:2:1:2:2

10. Worksheet Neutralization Reactions