`Cu^(+) and Na^(+)` are of same size but `CuCl` is insoluble while `NaCl` is soluble in water. Explain.

Explanation

To explain why CuCl is insoluble while NaCl is soluble in water, despite Cu^(+) and Na^(+) being of similar size, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Ionic Compounds**:
- Both CuCl and NaCl are ionic compounds composed of cations (Cu^(+) and Na^(+)) and anions (Cl^-). The solubility of ionic compounds in water depends on the balance between lattice energy and hydration energy.

2. **Defining Lattice Energy**:
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