The Reaction
When sodium metal (Na) is placed in water (H₂O), it undergoes a vigorous reaction to produce hydrogen gas (H₂) and sodium hydroxide (NaOH) solution.
Chemical Equation:
2 Na (s) + 2 H₂O (l) → 2 NaOH (aq) + H₂ (g)
Explanation:
1. Sodium's Reactivity: Sodium is a highly reactive alkali metal. It readily loses its outer electron to become a positively charged ion (Na⁺).
2. Water's Role: Water molecules are polar, meaning they have a slight positive charge on the hydrogen side and a slight negative charge on the oxygen side. This allows water to interact with the sodium ions.
3. Reaction Process:
* The sodium atom loses its electron to a water molecule, forming a sodium ion (Na⁺).
* The electron from the sodium atom attaches to a hydrogen atom in the water molecule, forming a hydrogen atom (H).
* Two hydrogen atoms combine to form a hydrogen molecule (H₂), which is released as a gas.
* The remaining hydroxide ion (OH⁻) combines with the sodium ion to form sodium hydroxide (NaOH), which dissolves in the water to form a solution.
Observations:
* Vigorous Reaction: The reaction is highly exothermic, meaning it releases heat. You'll observe a lot of bubbling, fizzing, and heat.
* Hydrogen Gas Evolution: You'll see hydrogen gas being released as bubbles.
* Solution Formation: The sodium hydroxide dissolves in the water, creating a clear, colorless solution.
Important Safety Note: This is a very dangerous reaction. Sodium reacts explosively with water, and the reaction can generate significant heat and potentially flammable hydrogen gas. Never attempt this experiment without proper safety equipment and supervision from a qualified chemist.
