An acidic buffer solution containing 0.04M H-COOH and H-COONa has PH 4. Calculate the concentration of H-COONa. Ka for H-COONa =1.78*10^-4
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Answer:
HOPE IT HELPS.
Explanation:
In this case, the pH of the solution will be equal to the acid's
p
K
a
. Now, if you have more conjugate base than weak acid, like you have here, you would expect the log term to return a positive value.
This means that the pH will actually increase, which is what you should expect to see in this case.
pH
=
p
K
a
+
log
(
[
HCOO
−
]
[
HCOOH
]
)
pH
=
3
,
.75
+
log
(
0.50
M
0.27
M
)
pH
=
3.75
+
0.268
=
4.02
Indeed, the pH of the buffer is higher than the
p
K
a
of the acid.
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