Write the chemical reaction between dichromate ion and iodide ion in acidic medium.
Answers
Answered by
1
Answer:
Potassium dichromate is a powerful oxidizing agent in acidic medium. In the presence of dilute sulphuric acid, it liberates nascent oxygen.
K
2
Cr
2
O
7
+4H
2
SO
4
→K
2
SO
4
+Cr
2
(SO
4
)
3
+4H
2
O+
Nascent oxygen
3(O)
In acidic medium, dichromate ion takes up electrons and acts as an oxidizing agent.
Cr
2
O
7
2−
+14H
+
+6e
−
→2Cr
3+
+7H
2
O
The net ionic equations for its reaction with (i) iodide (ii) iron(II) solution and (iii) H
2
S are as shown below.
Cr
2
O
7
2−
+6I
−
+14H
+
→2Cr
3+
+3I
2
+7H
2
O
Cr
2
O
7
2−
+6Fe
2+
+14H
+
→2Cr
3+
+6Fe
3+
+7H
2
O
Cr
2
O
7
2−
+3H
2
S+8H
+
→2Cr
3+
+3S+7H
2
O
Similar questions