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Chemistry
Chemistry
Problem
The equilibrium :
Cr
2
O
7
2
−
+
H
2
O
⇌
2
CrO
4
2
−
+
2
H
+
\text{Cr}_2\text{O}_7^{2-} + \text{H}_2\text{O} \rightleftharpoons 2\text{CrO}_4^{2-} + 2\text{H}^+
Cr
2
O
7
2
−
+
H
2
O
⇌
2
CrO
4
2
−
+
2
H
+
exist at
pH
=
4
\text{pH} = 4
pH
=
4
. The concentration of
[
CrO
4
2
−
]
[\text{CrO}_4^{2-}]
[
CrO
4
2
−
]
at equilibrium is : a.
4
×
K
c
×
[
Cr
2
O
7
2
−
]
4 \times K_c \times [\text{Cr}_2\text{O}_7^{2-}]
4
×
K
c
×
[
Cr
2
O
7
2
−
]
b.
2
×
K
c
⋅
[
Cr
2
O
7
2
−
]
2 \times \sqrt{K_c} \cdot [\text{Cr}_2\text{O}_7^{2-}]
2
×
K
c
⋅
[
Cr
2
O
7
2
−
]
c.
10
4
×
K
c
×
[
Cr
2
O
7
2
−
]
10^4 \times \sqrt{K_c} \times [\text{Cr}_2\text{O}_7^{2-}]
1
0
4
×
K
c
×
[
Cr
2
O
7
2
−
]
d.
10
−
8
×
K
c
×
[
Cr
2
O
7
2
−
]
10^{-8} \times K_c \times [\text{Cr}_2\text{O}_7^{2-}]
1
0
−
8
×
K
c
×
[
Cr
2
O
7
2
−
]
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