Question

Write balanced chemical reaction between Sodium metal with cold water .

Answer 1

Reaction between Sodium (Na) metal and cold water (H₂O)

• Sodium metal reacts with cold water to form a colourless solution of Sodium Hydroxide $\left(\mathrm{NaOH}\right)$ and Hydrogen gas $\left({\mathrm{H}}_2\right)$ is liberated.
• Metals which lie topmost in the reactivity series react with cold water, metals which lie a bit below react with hot water while metals which lie in the lower middle order react with steam.
• Sodium is a highly reactive metal , so it reacts with cold water.

$\underset{\mathrm{Sodium}}{2\mathrm{Na}\left(\mathrm{s}\right)}+2\underset{\mathrm{cold}\mathrm{water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Sodium}\mathrm{Hydroxide}}{2\mathrm{NaOH}\left(\mathrm{aq}\right)}+\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}$