1. Ionic Nature of NaCl:
* Sodium chloride (NaCl) is an ionic compound. This means it's formed by the electrostatic attraction between positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-).
2. Solid State:
* In the solid state, these ions are locked in a rigid, crystalline lattice. The ions are tightly packed and held in place by strong electrostatic forces. This rigid structure prevents the free movement of ions.
* Without free-moving charge carriers (like ions), electricity cannot flow. Therefore, solid NaCl is a poor conductor of electricity.
3. Molten State:
* When NaCl melts, the ions break free from their fixed positions. The strong electrostatic forces holding the ions together weaken, allowing them to move more freely.
* These mobile ions act as charge carriers. When a voltage is applied, the positive sodium ions move towards the negative electrode, and the negative chloride ions move towards the positive electrode. This flow of ions constitutes an electric current.
In summary:
* Solid NaCl: Ions are fixed, no free charge carriers, no conductivity.
* Molten NaCl: Ions are mobile, free charge carriers, good conductivity.
