Question

Why is sodium kept immersed in kerosene oil?

Give reason:

Sodium, potassium and lithium are stored under oil.

Sodium metal is stored under kerosene oil, Why?

Answer 1

Sodium is highly reactive and reacts with both air and water. When exposed to air, it quickly combines with oxygen to form its oxide. Similarly, it reacts with water or moisture to produce sodium hydroxide. 

\[\ce{4Na_{(s)} + O2_{(g)} -> 3Na2O_{(s)}}\]

\[\ce{2Na_{(s)}\underset{or moisture}{+ 2H2O_{(l)}} -> 2NaOH_{(aq)} + H2_{(g)}}\]

To protect sodium metal, it is typically stored under kerosene to prevent contact with air or moisture.

Answer 2

1. Sodium, potassium, and lithium are very reactive metals that react vigorously with air and water. Therefore, they are kept immersed in kerosene oil to prevent their contact with air and moisture.
2. Sodium metal is highly reactive. Moisture in the air forms sodium hydroxide and releases hydrogen, which releases a significant amount of heat, resulting in fire.