Post on 02-Jan-2016
ACID-BASE THEORIES
Svante Arrhenius Johannes Brönsted Thomas Lowry
Aim and ObjectivesAim: How do you categorize a chemical?
Objectives:
1.Students should be able to identify acids based on the Arrhenius and Alternate theories.
2.Students should be able to use the Reference Tables to identify acids and bases.
3.Students should know the properties of acids and bases.
Arrhenius Acid
• H+ ion is the only positive ion in an aqueous solution.
The H+ ion is also called a __________. Why?
Ex. HCl(l) H+(aq) + Cl-(aq)
The H+ ion reacts with water to produce the__________________.
Ex. H+(aq) + H2O(l) H3O+(aq)
Note: Not all substances that contain H are acids. Ex. CH4
Arrhenius Base
• OH- ion is the only negative ion in an aqueous solution.
NaOH Na+ + OH- [Typical Bases]
NH3 + H2O NH4+ + OH- [Ammonia]
CH3NH2 + H2O CH3NH3+ + OH- [Amines]
Alternate Acid/Base Theory• Acids are proton donors. [AD]• Bases are proton acceptors.• Take into consideration the forward and
reverse reactions.
HCl + H2O ↔ H3O+ + Cl-
FWD Reaction: Acid = HCl because it gives up an H+,
Base = H2O because it accepts the H+.
REV Reaction: Acid = ________, Base = _________
Acid Base Review Table
Characteristic Acid BaseTaste
Electrolyte?
Litmus
Phenolphthalein
React with Metals to Produce H2?
Arrhenius Theory
Alternate Theory
Regents Questions
HW: OB: Topic 9: Acids and Bases Q 1-3, 5, 24-27, 32, 36
Aim: How do we categorize a chemical?
Acids and bases are categorized by…