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Sodium is always kept in kerosene. or In the laboratory, sodium is immersed in kerosene. - Science and Technology 1

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Short Note

Write scientific reason.

Sodium is always kept in kerosene.

In the laboratory, sodium is immersed in kerosene.

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Solution 1

Sodium is a very reactive metal. It is kept in kerosene to prevent it from coming in contact with oxygen and moisture. If this happens, it will react with the moisture present in air and form sodium hydroxide. This is a strongly exothermic reaction and lot of heat is generated.

Solution 2

  1. Sodium reacts with moisture present in air, even at room temperature, to form sodium hydroxide and hydrogen gas.
    \[\ce{\underset{\text{Sodium}}{2Na_{(s)}} + \underset{\text{Water}}{2H2O}_{(l)} -> \underset{\text{hydroxide}}{\underset{\text{Sodium}}{2NaOH}_{(aq)}} + \underset{\text{Hydrogen}}{2H_{2(g)}}}\]
  2. The reaction is exothermic and therefore, the released hydrogen gas readily catches fire on exposure to air.
    Hence, to prevent accidents, sodium is stored in kerosene.
Concept: Type of Elements: Metals
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