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Chemistry
Chemistry
Problem
For the aqueous equilibrium
F
e
S
C
N
2
+
(
a
q
)
⇌
F
e
3
+
(
a
q
)
+
S
C
N
−
(
a
q
)
\mathrm{FeSCN^{2+}(aq) \;\rightleftharpoons\; Fe^{3+}(aq) + SCN^-(aq)}
FeSC
N
2
+
(
aq
)
⇌
F
e
3
+
(
aq
)
+
SC
N
−
(
aq
)
K
c
=
1.5
×
10
2
K_c = 1.5\times10^{2}
K
c
=
1.5
×
1
0
2
at 298 K. A 1.00 L solution initially contains
[
F
e
S
C
N
2
+
]
0
=
0.050
M
[\mathrm{FeSCN^{2+}}]_0 = 0.050\,\text{M}
[
FeSC
N
2
+
]
0
=
0.050
M
and no
F
e
3
+
\mathrm{Fe^{3+}}
F
e
3
+
or
S
C
N
−
\mathrm{SCN^-}
SC
N
−
. Calculate the equilibrium concentration of
F
e
S
C
N
2
+
\mathrm{FeSCN^{2+}}
FeSC
N
2
+
(aq) at 298 K.
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