Unit #1Unit #2Unit #3Unit #4Unit #5Unit #6Unit #7Unit #8Unit #9Unit #10
spacerUNIT # 10  
spacerspacerIntroduction
spacerspacerObjectives
spacerspacerReading

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spacer10.1 Properties
spacerof Acids and
spacerBases

spacer10.2 Strong/Weak
spacerAcids

spacer10.3 Strong/Weak
spacerBases

spacer10.4 Neutralization
spacerReactions

spacer10.5 Calculations
spacerInvolving
spacerNeutalization
spacerReactions

spacer10.6 pH & pOH
spacerScales
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spacernextProblems

Unit 10 ACIDS & BASES AND IONIC REACTIONS

10.3 - Strong and Weak Bases

"Strong" bases ionize completely in water.
Example: Sodium hydroxide, NaOH, is a strong base.

Bases are substances that releases hydroxide ions, OH-, in water.

"Strong" bases ionize completely in water. For example,


The above reaction indicates that when sodium hydroxide reacts with water, hydroxide ions are produced in aqueous solution. Note that the arrow points to the products, indicating that virtually ALL the NaOH becomes Na+ and OH- ions in aqueous solution. NaOH is therefore a strong base.

"Weak" bases ionize partially in water.


Ammonia, NH3, does not completely ionize in water. Most of the ammonia in solution remains un-ionized and a small fraction ionizes to form OH- and NH4+ ions. To represent this in a chemical equation, a double arrow is used. The longer arrow pointing toward the reactants indicates that ammonia in solution remains un-ionized. NH3 is classified as a weak base.

Important Bases:

Learn the names and formulae of eight strong bases.

Learn the names and formulae of one weak base.

Link
Animation

 

Section 15.2
The Strengths of Acids and Bases ..p409

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All contents copyrighted © 1996-2006
British Columbia Institute of Technology
Chemistry Department - 3700 Willingdon Avenue
Burnaby, B.C. Canada V5G 3H2


All contents copyrighted © 1996-2006
British Columbia Institute of Technology
Chemistry Department - 3700 Willingdon Avenue
Burnaby, B.C. Canada V5G 3H2