1. Calculate degree of dissociation and concentration of h30+ ions in 0.01m solution of formic
acid,ka=2.1x10*at
298 K
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Answer:
Explanation:⠀
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know that the equilibrium constant is also equal to
K
a
=
[
HCOO
−
]
⋅
[
H
3
O
+
]
[
HCOOH
]
K
a
=
x
⋅
x
0.20
−
x
Since
K
a
is small compared with the initial concentration of the acid, you can approximate
(
0.20
−
x
)
with
0.20
. This will give you
K
a
=
x
2
0.2
⇒
x
=
√
0.2
⋅
1.78
⋅
10
−
4
=
5.97
⋅
10
−
3
The concentration of the hydronium ions will thus be
x
=
[
H
3
O
+
]
=
5.97
⋅
10
−
3
M
This means that the solution's pH will be
p
H
sol
=
−
log
(
[
H
3
O
+
]
)
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