In Class 10 Chemistry, studying how different metals react with water is a key topic. Let's look at the explosive reaction of Sodium, and also learn the chemical meaning of a common kitchen item: 'Sirka'.
Sodium (Na): Highly reactive; must be stored in Kerosene.
Reaction Type: Highly Exothermic (releases heat).
Gas Released: Hydrogen gas (which catches fire).
Sirka (Vinegar): A 5-8% solution of Acetic Acid in water.
Sodium (Na) is a highly reactive alkali metal. When you drop a piece of sodium into cold water, an incredibly violent chemical reaction occurs immediately.
The Chemical Equation: $2Na + 2H_2O \rightarrow 2NaOH + H_2 \uparrow + \text{Heat Energy}$
What happens?: The sodium reacts with water to form Sodium Hydroxide (an alkali) and releases Hydrogen gas ($H_2$).
Why does it catch fire?: This reaction is highly Exothermic (it releases a massive amount of heat). The heat produced is so intense that the released Hydrogen gas instantly catches fire, causing the sodium piece to burn with a golden-yellow flame and dart across the water surface. (This is why Sodium is always stored submerged in Kerosene oil, to prevent it from reacting with the moisture in the air).
'Sirka' (सिरका) is the Hindi word for Vinegar, a very common liquid used in cooking (like making Chowmein) and preserving pickles.
When sodium reacts with water, it forms sodium hydroxide and releases hydrogen gas. The reaction is so highly exothermic (heat-releasing) that the hydrogen gas immediately catches fire, causing a small explosion.
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