Given that, `Co^(3+) +e^(-)rarr Co^(2+) , E^(@) = +1.82 V`
`2H_(2)O rarr O_(2) +4H^(+) +4e^(-), E^(@) =- 1.23 V`.
Explain why `Co^(3+)` is not stable in aqueous solutions.

Explanation

To explain why \( \text{Co}^{3+} \) is not stable in aqueous solutions, we can analyze the given half-reactions and their standard electrode potentials.

### Step-by-Step Solution:

1. **Identify the Half-Reactions and Their Potentials:**
- The first half-reaction is:
\[
\text{Co}^{3+} + e^- \rightarrow \text{Co}^{2+}, \quad E^\circ = +1.82 \, \text{V}
...