Chemistry Worksheet Template: Arrhenius Acids (With Answer Key) Page 2
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43. Defining acids and bases in terms of the characteristic ions that are released in
water solution is the Arrhenius Theory of acids and bases. In the space below, list
some examples of Arrhenius acids and Arrhenius bases.
Arrhenius
Arrhenius
Acids
Bases
HCl
NaOH
H
SO
KOH
2
4
HC
H
O
Ba(OH)
2
3
2
2
HBr
Ca(OH)
2
HClO
NH
4
3
4. a. Draw the Lewis structure for water, H
O.
2
b. Describe how water might break up into ions. Write a chemical equation for
this process. How is water related to Arrhenius acids and bases?
+
–
H
O
H
+ OH
(l)
(aq)
(aq)
2
Or
+
–
H
O
+ H
O
H
O
+ OH
(l)
(l)
(aq)
(aq)
2
2
3
+ (aq)
Water breaks up into the ions that are characteristic of acids, H
and
– (aq)
bases, OH
.
c. Unlike HCl only a small fraction of water molecules break up into ions. The
–14
equilibrium constant for water dissociating into ions is 1.0 x 10
. Write an
equilibrium expression for the dissociation of water. What would be the
concentration of each of the ions in a pure sample of water?
+
–
H
O
H
+ OH
(l)
(aq)
(aq)
2
Initial
----
0
0
Change
----
+x
+x
x = [H
O]
2
reacted
Equilibrium
----
0+x
0+x
+
–
K
= [H
][OH
]
w
–14
1.0 x 10
= (x)(x)
–7
1.0 x 10
M = x
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