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Presentation on theme: "Conjugate acids and bases"— Presentation transcript:
Slide1
Conjugate acids and bases
Slide2
Different definitions of acids and bases
Acids are proton donors (
Brønsted
Lowry definition)
they generate H
3
O
+
in water (Arrhenius definition)
Bases are proton acceptors
they generate OH
-
in water
which is an acid/base?
HF +
H
2
O
H
3
O
+
+ F
-
NaHCO
3
+
H
2
O
Na
+
+H
2
O + CO
2
+ OH
-
Slide3
Follow the proton
HF + H2O H3O+ + F-NaHCO3 + H2O Na++ H2O+CO2 +OH-Joining equilibrium to acid base…What about the reverse reaction?
H
+
H+
H
+
H
+
Slide4
Conjugate acids and bases
When you run the reverse reaction you find the products are also acids and bases. The acids and bases that are formed are called
conjugate acids or bases
H
2
O
+
HF
H
3
O
+
+
F
-
base
acid
conjugate acid
conjugate base
NaHCO
3
+
H
2
O
Na
+
+H
2
O + CO
2
+
OH
-
base
acid
CA
CB
Slide5
Label Acid, Base, Conjugate Acid, Conjugate Base
HClO
3
+
H
2
O
ClO
3
-
+
H
3
O
+
A B CB CA
ClO
-
+
H
2
O
HClO
+
OH
-
B A CA CB
HSO
4
-
+ H
2
O
SO
4
2-
+
H
3
O
+
A B CB CA
LiOH
+ H
2
O
Li
+
+ H
2
O
+
OH
-
B A CA CB
Slide6
Conjugate acids and bases …
Conjugate acids and bases determine if an acid or base is strong or weak.
If the conjugate acid/base readily reacts to run the reverse reaction it is a
