Salicylic acid, HOC 6 H 4 CO 2 H , and its derivatives have been used as pain relievers for a long time. Salicylic acid occurs in small amounts in the leaves, bark, and roots of some vegetation (most notably historically in the bark of the willow tree). Extracts of these plants have been used as medications for centuries. The acid was first isolated in the laboratory in 1838. (a) Both functional groups of salicylic acid ionize in water, with K a = 1.0 × 10 − 3 for the − CO 2 H group and 4.2 × 10 - 13 for the - OH group. What is the pH of a saturated solution of the acid (solubility = 1.8 g/L). (b) Aspirin was discovered as a result of efforts to produce a derivative of salicylic acid that would not be irritating to the stomach lining. Aspirin is acetylsalicylic acid, CH 3 CO 2 C 6 H 4 CO 2 H . The − C O 2 H functional group is still present, but its acidity is reduced, K a =3 .0 10 -4 . What is the pH of a solution of aspirin with the same concentration as a saturated solution of salicylic acid (See Part a).
Salicylic acid, HOC 6 H 4 CO 2 H , and its derivatives have been used as pain relievers for a long time. Salicylic acid occurs in small amounts in the leaves, bark, and roots of some vegetation (most notably historically in the bark of the willow tree). Extracts of these plants have been used as medications for centuries. The acid was first isolated in the laboratory in 1838. (a) Both functional groups of salicylic acid ionize in water, with K a = 1.0 × 10 − 3 for the − CO 2 H group and 4.2 × 10 - 13 for the - OH group. What is the pH of a saturated solution of the acid (solubility = 1.8 g/L). (b) Aspirin was discovered as a result of efforts to produce a derivative of salicylic acid that would not be irritating to the stomach lining. Aspirin is acetylsalicylic acid, CH 3 CO 2 C 6 H 4 CO 2 H . The − C O 2 H functional group is still present, but its acidity is reduced, K a =3 .0 10 -4 . What is the pH of a solution of aspirin with the same concentration as a saturated solution of salicylic acid (See Part a).
Salicylic acid,
HOC
6
H
4
CO
2
H
, and its derivatives have been used as pain relievers for a long time. Salicylic acid occurs in small amounts in the leaves, bark, and roots of some vegetation (most notably historically in the bark of the willow tree). Extracts of these plants have been used as medications for centuries. The acid was first isolated in the laboratory in 1838.
(a) Both functional groups of salicylic acid ionize in water, with
K
a
=
1.0
×
10
−
3
for the
−
CO
2
H
group and
4.2
×
10
-
13
for the -OH group. What is the pH of a saturated solution of the acid (solubility = 1.8 g/L).
(b) Aspirin was discovered as a result of efforts to produce a derivative of salicylic acid that would not be irritating to the stomach lining. Aspirin is acetylsalicylic acid,
CH
3
CO
2
C
6
H
4
CO
2
H
.
The
−
C
O
2
H
functional group is still present, but its acidity is reduced,
K
a
=3
.0 10
-4
. What is the pH of a solution of aspirin with the same concentration as a saturated solution of salicylic acid (See Part a).
Definition Definition Group of atoms that shape the chemical characteristics of a molecule. The behavior of a functional group is uniform in undergoing comparable chemical reactions, regardless of the other constituents of the molecule. Functional groups aid in the classification and anticipation of reactivity of organic molecules.
When a solution of sodium hydroxide is added to a solution of ammonium carbonate, H2O is formed and ammonia gas, NH3, is released when the solution is heated. Write a net ionic equation for this reaction. Both NaOH and (NH4)2CO3 exist as dissociated ions in an aqueous solution.
6. Acids and bases are defined by their donation or acceptance of a proton according to the
(a) Arrhenius model.
(b) Bronsted-Lowry model.
(c) Lewis model.
When a solution of sodium hydroxide is added to a
solution of ammonium carbonate, H,O is formed and
ammonia gas, NH, is released when the solution is
heated. Write a net ionic equation for this reaction.
Both NaOH and (NH ),CO, exist as dissociated ions in
aqueous solution.
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