Wednesday March 21, 2012 (Neutralization Reactions)

WednesdayMarch 21, 2012

(Neutralization Reactions)

Bell RingerWednesday, 3-21-12

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? ___________

Assignment Currently Open

Summative or

Formative

Date Issued

Date Due

Date Into

Grade Book

Last Day

WS - Solute – Solvent Interactions F 2/22 2/27

Molarity – Concentration of Solution F 2/29 3/5

QUIZ – ELECTROLYTES, NON-ELECTROLYTES, &

MOLARITYS 3/2 3/2 3/2 3/23

What Do You Know About Acids and Bases? F 3/5 3/8

WS – The pH Scale F 3/8 3/9

QUIZ – Acids, Bases, and pH S 3/9 3/9 3/9 3/30

WS – Acid-Base Strength F 3/19 3/21

Announcements

I will not be available this afternoon after

school.

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.

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.


• 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


• Sodium bicarbonate (baking soda), NaHCO3, and tartaric acid, C4H6O6, 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?


H2C4H4O6 æ H+ + C4H4O6-

NaHCO3 æ Na+ + HCO3-

H+ + HCO3- æ HOH + CO2

Na+ + C4H4O6- æ Na2C4H4O6

Complete ReactionH2C4H4O6 + NaHCO3 → Na2C4H4O6 + CO2 + H2O

Can you balance this equation?

1:2:1:2:2

Worksheet


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Wednesday March 21, 2012 (Neutralization Reactions)