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K
_{2}
Cr
_{2}
^{VI}
O
_{7}
+
6
K
I
^{I}
+
7
H
_{2}
S
O
_{4}
→
4
K
_{2}
S
O
_{4}
+
Cr
_{2}
^{III}
(
S
O
_{4}
)
_{3}
+
3
I
_{2}
^{0}
+
7
H
_{2}
O
Cr
^{VI}
+
3
e
^{}
→
Cr
^{III}
I
^{I}

1
e
^{}
→
I
^{0}
Change the oxidation states
Search by reactants (
K
_{2}
Cr
_{2}
O
_{7}
,
K
I
,
H
_{2}
S
O
_{4}
)
1.
K
_{2}
Cr
_{2}
O
_{7}
+
KI
+
H
_{2}
SO
_{4}
→ K
_{2}
SO
_{4}
+ Cr
_{2}
(SO
_{4}
)
_{3}
+ I
_{2}
+ H
_{2}
O
Search by products (
K
_{2}
S
O
_{4}
,
Cr
_{2}
(
S
O
_{4}
)
_{3}
,
I
_{2}
,
H
_{2}
O
)
1.
K
_{2}
Cr
_{2}
O
_{7}
+ KI + H
_{2}
SO
_{4}
→
K
_{2}
SO
_{4}
+
Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
H
_{2}
O
2.
K
_{2}
Cr
_{2}
O
_{7}
+ HI + H
_{2}
SO
_{4}
→
K
_{2}
SO
_{4}
+
Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
H
_{2}
O
3.
K
_{2}
Cr
_{2}
O
_{7}
+ NaI + H
_{2}
SO
_{4}
→
Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
K
_{2}
SO
_{4}
+ Na
_{2}
SO
_{4}
+
H
_{2}
O
4.
K
_{2}
CrO
_{7}
+ NaI + H
_{2}
SO
_{4}
→
Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
K
_{2}
SO
_{4}
+ Na
_{2}
SO
_{4}
+
H
_{2}
O
Search by reactants (
K
_{2}
Cr
_{2}
O
_{7}
,
K
I
,
H
_{2}
S
O
_{4}
) and by products (
K
_{2}
S
O
_{4}
,
Cr
_{2}
(
S
O
_{4}
)
_{3}
,
I
_{2}
,
H
_{2}
O
)
1.
K
_{2}
Cr
_{2}
O
_{7}
+
KI
+
H
_{2}
SO
_{4}
→
K
_{2}
SO
_{4}
+
Cr
_{2}
(SO
_{4}
)
_{3}
+
I
_{2}
+
H
_{2}
O