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CH302 Chapter 7 notes part 3

CH302 Chapter 7 notes part 3 - CH302 Chapter 7 notes part 3...

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CH302 Chapter 7 notes part 3 ACIDS and BASES Base Definitions Arrhenius: Base produces OH- ions (very limiting): Brønstead-Lowry definition: A BASE is a PROTON ACCEPTOR We have seen that both water and ammonia can act as acids and bases in the Brønstead-Lowry sense, but that for ammonia AND water together, ammonia acts predominantly as a (weak) base. Generic Base Dissociation Weak or Strong Base? Acids and Bases can be weak or strong Base Strength: How much the base breaks apart in solution. Examples: NaOH (aq) Na + (aq) + OH - (aq) strong base NH 3(aq) + H 2 O (l) NH 4 + (aq) + OH - (aq) weak base Weak or Strong? ALL Group 1A (alkalai metal) hydroxides are STRONG bases. All are WATER SOLUBLE. Only Na and K versions are in common use ($$) Some Group 2A (alkalai earth metals) hydroxides are STRONG bases: Ca, Ba, Sr hydroxide. These are NOT very soluble in water. Lower solubility bases like Mg(OH) 2 and Al(OH) 3 have uses as antacids.. less free OH - to hurt your insides, but plenty to react with stomach acid! Table 7.3 for values of K b : : Note there are lots of different weak bases that are similar to ammonia, but where one or more H groups are replaced with hydrocarbon groups.
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