Answer to Question #139393 in General Chemistry for raymart deocares

Question

D. Give the balanced redox reactions of the following. Show your solution.

1. Al + Cu2 Al3 + Cu
2. ClO3 - (aq) + I- (aq) I2 (s) + Cl- (aq) [acidic]

Answer 1

Ans.

Al – 3e                     Al³⁺……..(i)

Cu²⁺  + 2e                       Cu     …(ii)

Multiplying eqn. i with 2 and eqn ii with 3 and then adding we get

2Al + 3Cu²⁺                               3Cu + 2Al³⁺ (Ans.)

(ii) In acidic medium,

ClO₃^-   + 6H⁺ +6e                  Cl^-  + 3H₂O           ……..(iii)

2I^-  - 2e                      I₂      (iv)

Multiplying eqn. iii with 1 and eqn iv with 3 and then adding we get

ClO₃^-   + 6H⁺ + 6I^-                   3I₂  + Cl^-  + 3H₂O (Ans.)