OH Aso;? + Mno- -1 → AsO-+ MnO2
Answers
Answer:
The unbalanced redox equation is as follows:
AsO
3
3−
+MnO
4
−
→AsO
4
3−
+MnO
2
+H
2
O
All atoms other than H and O are balanced.
The oxidation number of As changes from +3 to +5. The change in the oxidation number of As is +2.
The oxidation number of Mn changes from +7 to +4. The change in the oxidation number of Mn is 3.
The increase in the oxidation number is balanced with decrease in the oxidation number by multiplying
AsO
3
3−
and AsO
4
3−
with 3 and multiplying MnO
4
−
and MnO
2
with 2.
3AsO
3
3−
+2MnO
4
−
→3AsO
4
3−
+2MnO
2
+H
2
O
O atoms are balanced.
3AsO
3
3−
+2MnO
4
−
→3AsO
4
3−
+2MnO
2
+H
2
O
Hydrogen atoms are balanced by adding 2 H
+
atoms on the LHS.
3AsO
3
3−
+2MnO
4
−
+2H
+
→3AsO
4
3−
+2MnO
2
+H
2
O
Since the reaction occurs in basic medium, add 2 hydroxide ions on both sides of the equation.
3AsO
3
3−
+2MnO
4
−
+2H
+
+2OH
−
→3AsO
4
3−
+2MnO
2
+H
2
O+2OH
−
On LHS, 2 H
+
ions combine with 2 OH
−
ions to form 2 water molecules out of which, one water molecule cancels with one water molecule on RHS..
3AsO
3
3−
+2MnO
4
−
+H
2
O→3AsO
4
3−
+2MnO
2
+2OH
−
This is the balanced chemical equation
Explanation:
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