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Acids and Bases: Acidity
Related Topics
Wize University Chemistry Textbook > Acids and Bases
Acid Equations (Ka, pKa)
3 Activities
Nitrous acid has a Ka of 7.1 x 10
-5
. What are [H
3
O
+
] and [NO
2
-
] in 0.50 M HNO
2
?
1.2x10
-3
M
1.8x10
-3
M
6.0x10
-3
M
8.9x10
-3
M
I don't know
Check Submission
More Acid Equations (Ka, pKa) Questions:
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What are the K
a
and K
b
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
Methyl diethanolamine CH
3
N(C
2
H
4
OH)
2
is a weak base which we will abbreviate as
mdea
. The conjugate acid,
mdeaH
+
, has a pKa = 8.52.
Nitrous acid has a Ka of 7.1 x 10
-5
. What are [H
3
O
+
], [NO
2
-
] andin 0.50 M HNO
2
?
Acids and Bases: Weak Acid Practice
Nitrous acid has a K
a
of 7.1 x 10
-5
. What are [H
3
O
+
] and [NO
2
-
] in 0.50 M HNO
2
?
Nitrous acid has a Ka of 7.1 x 10
-5
. What are [H
3
O
+
], [NO
2
-
] andin 0.50 M HNO
2
?
Acids and Bases: Ka
The following occurs when HCl is placed in water:
HCl <----> H
+
+ Cl
-
The K
a
for this reaction is known to be K
a
= 5.64 once it reaches equilibrium. At equilibrium, 1.35 x 10
-7
M of HCl and 1.2 M of Cl
-
can be found. What is the pH of the solution at equilibrium?
The following reaction occurs in water:
CH
3
OH <----> CH
3
O
-
+ H
+
Once the reaction was allowed to reach equilibrium, 0.5 M of CH
3
OH, 0.3 M of CH
3
O
+
, and 0.3 M of H
+
were found in solution. What is the K
a
of this solution?
The equilibrium constant for the auto-ionization of water at 10 °C is 3.0 x 10
-15
. What is the concentration of H
3
O
+
ions in pure water at this temperature?
What is the pH of a 1.1M solution of nitrous acid (HNO
2
). The K
a
of nitrous acid is 7.2 x 10
-4
Ammonia(NH
3
) is a weak base, K
b
= 1.8 x 10
-5
and benzoic acid (C
6
H
5
CH
2
O
-
) is a weak acid, K
a
= 6.3 x 10
-5
. A solution of ammonium benzoate (NH
4
)(C
6
H
5
CH
2
O
-
) is:
To 4.00 L of water was added 100 mg of HF (6.6 x 10
-4
). What is the pH?
CH
3
COOH is a weak acid with a K
a
of 1.8 x 10
-5
. In what pH range would you most likely an aqueous solution of Na(CH
3
COO).
Acids and Bases: Henderson Hasselbalch
To a solution of acetic acid (
K
a
=
1.8
×
10
−
5
\rm K_a = 1.8 \times 10^{-5}
K
a
=
1.8
×
1
0
−
5
) was added 0.1 mol of
N
a
O
H
\rm NaOH
NaOH
. After the addition of
N
a
O
H
\rm NaOH
NaOH
the volume was 1.4L and the
p
H
\rm pH
pH
was 5.2.
a) This solution a buffer? (True/False)
b) Calculate the number of moles of acetic acid that were originally in solution. Report your answer in moles to three significant figures. Do not include units in the answer field
Calculate the pH of the solution resulting from the addition of 10.0 mL of a 0.10 M NaOH to 50.0 mL of 0.10 M HCN (Ka = 4.9 x 10
-10
) solution
A solution of [CH
3
NH
3
][CH
3
COO] is made in an undergraduate laboratory. Use the information below to predict the acidity of the solution.
CH
3
COOH: K
a
= 1.8 x 10
-5
CH
3
NH
3
+
: K
a
= 2.3 x 10
-11
Strength of Acids and Bases
What is the strongest acid below? What is the weakest acid?
Strongest acid:
Cl
3
CCOOH
Weakest acid:
HCN
Acids and Bases: Conjugate
Using the data in the table, which of the conjugate bases below is the strongest base?
A
c
i
d
K
a
H
O
A
c
1.8
×
10
−
5
H
C
H
O
2
1.8
×
10
−
4
H
C
l
O
3.0
×
10
−
8
H
F
6.8
×
10
−
4
\def\arraystretch{1.5} \begin{array}{c} \hline \rm Acid &&&K_a\\ \hline HOAc&&&1.8 \times 10^{-5}\\ HCHO_2&&&1.8 \times 10^{-4}\\ HClO &&& 3.0 \times 10^{-8}\\ HF &&& 6.8 \times 10^{-4}\\ \hline \end{array}
Acid
H
O
A
c
H
C
H
O
2
H
C
l
O
H
F
K
a
1.8
×
1
0
−
5
1.8
×
1
0
−
4
3.0
×
1
0
−
8
6.8
×
1
0
−
4
Which of the solutions below would have the HIGHEST pH value?
Methyl diethanolamine CH
3
N(C
2
H
4
OH)
2
is a weak base which we will abbreviate as
mdea
. The conjugate acid,
mdeaH
+
, has a pKa = 8.52.
Practice: Relating [H3O+], [OH-], pH and pOH
Compare two acids and their 1M solution:
A
c
i
d
1
:
K
a
=
1.0
×
10
−
3
A
c
i
d
2
:
K
a
=
1.0
×
10
−
6
\rm Acid\ 1:K_a=1.0\times10^{-3}\qquad Acid\ 2:K_a=1.0\times10^{-6}
Acid
1
:
K
a
=
1.0
×
1
0
−
3
Acid
2
:
K
a
=
1.0
×
1
0
−
6