why sodium and potassium kept in kerosene Give reasons why sodium and potassium are stored in kerosene?
When we think of sodium, most of us might imagine a small, reactive, metallic element that explodes violently when exposed to water. While this isn’t entirely wrong, there’s more to this metal than meets the eye. A curious fact about sodium is that it’s often kept immersed in kerosene oil. But why is this the case?
Sodium is one of the most reactive metals known to man. Its reactivity is so high that it easily reacts with moisture present in the air. A thin oxide layer is formed around the metal when it comes in contact with air. When sodium is immersed in water, this oxide layer reacts with water to form sodium hydroxide (NaOH) and hydrogen gas (H2). This chemical reaction is highly exothermic, resulting in a violent explosion. Therefore, it’s crucial to store sodium in an inert medium to prevent it from reacting with moisture present in the air.
Kerosene oil is a non-polar solvent that doesn’t react with sodium. When sodium is kept in kerosene oil, it doesn’t come in contact with moisture present in the air, preventing the formation of an oxide layer on the surface of the metal. Furthermore, kerosene oil is denser than water, which means sodium floats on top of it, making it easier to handle.
While sodium reacts violently with water, it’s interesting to note that it floats in it. This outermost layer of sodium is responsible for repelling water molecules, which is why sodium floats in water.
Another factor that contributes to the floating of sodium is the buoyancy force. The buoyancy force is the force that opposes the weight of an object submerged in a fluid. Sodium has a density of 0.97 g/cm³, which is lower than the density of water (1 g/cm³). Therefore, the buoyancy force acting on sodium is greater than its weight, causing it to float on the surface of water.
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