Question

Explain the following : Lithium floats on water while sodium floats and catches fire when put in water.​

Answer 1

Answer:

sodium and pottasium are the lightest metal and kept under kerosene if they are get into water they will catch fire

Answer 2

1. When lithium and sodium react with water, hydrogen gas is released. Due to these hydrogen gas bubbles, lithium and sodium float on water. eg. 2Na + 2H2O → (2Na^-) + (2OH^+) + H2
2. The reactivity of group 1 metals increases with increasing atomic radius and lowering of ionization enthalpy down the group.
3. Thus, sodium having lower ionization enthalpy is more reactive than lithium.
4. Hence, lithium reacts slowly while sodium reacts vigorously with water.
5. Since the reaction of sodium with water is highly exothermic, it catches fire when put in water.