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Chemistry
Calcium lactate is a salt of a weak acid represented as Ca ( Lac )2. Its saturated solution contain 0.13 mole in 0.50 L solution and pH is 8.4. Assume complete dissociation of the salt, p Ka of the lactic acid is
Q. Calcium lactate is a salt of a weak acid represented as
C
a
(
L
a
c
)
2
. Its saturated solution contain
0.13
mole in
0.50
L
solution and
p
H
is
8.4
. Assume complete dissociation of the salt,
p
K
a
of the lactic acid is
1645
243
Equilibrium
Report Error
A
6.16
17%
B
10.92
48%
C
3.085
26%
D
5.80
9%
Solution:
Lactic acid is a weak monobasic acid
M
C
a
(
L
a
c
)
2
⇌
2
M
2
L
a
c
−
+
C
a
2
+
C
a
(
L
a
c
)
2
=
0.50
L
0.13
m
o
l
=
0.26
m
o
l
L
−
1
∴
[
L
a
c
]
=
0.26
×
2
=
0.52
M
Aqueous solution of lactate is basic due to hydrolysis of
L
a
c
−
L
a
c
−
+
H
2
O
⇌
L
a
cH
+
O
H
−
p
H
=
7
+
2
p
K
a
+
2
l
o
g
C
8.4
=
7
+
2
p
K
a
+
2
l
o
g
0.52
8.4
=
7
+
2
p
K
a
+
(
−
0.14
)
p
k
a
=
3.08