Extraction is the process of pulling a metal out of its ore. Imagine a toy hidden inside a box – you need the right key to open it and get the toy out.
The reactivity series is like a ladder that tells us how easily a metal will react. The higher a metal is, the easier it is to pull it out of its ore.
| Position | Metal | Typical Extraction Method |
|---|---|---|
| 1 | Potassium | Electrolysis of molten KCl |
| 2 | Sodium | Electrolysis of molten NaCl |
| 3 | Aluminium | Hall–Héroult electrolytic process |
| 4 | Iron | Smelting with carbon (coke) |
| 5 | Copper | Reduction with carbon or hydrogen |
Metals higher up the ladder are more reactive, so they can be extracted with simpler reactions. Lower down, the metal is less reactive and needs more energy or a stronger reducing agent.
Example: Iron (Fe) is lower than Aluminium (Al) in the series. To get iron from iron ore we use a smelting process with carbon:
\$2 \text{Fe}2\text{O}3 + 3 \text{C} \rightarrow 4 \text{Fe} + 3 \text{CO}_2\$
This is easier than extracting aluminium, which requires the energy‑intensive Hall–Héroult process.