Question

Complete and balance the equation

$\mathrm{Na}+2{\mathrm{H}}_2\mathrm{O}\to$

Answer 1

Reaction between Sodium and water:

• When Sodium reacted with water it produces sodium hydroxide and hydrogen with a large amount of heat.
• Since heat evolved in this reaction. So, this is an example of an Exothermic reaction.
• The chemical reaction can be written as:

$\underset{\mathrm{Sodium}}{\mathrm{Na}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Sodium}\mathrm{hydroxide}}{\mathrm{NaOH}\left(\mathrm{l}\right)}+\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}+\mathrm{Heat}$

Balancing of the chemical equation.

• The number of atoms of Sodium and Oxygen is equal on both sides. But Hydrogen atoms are not the same.

Atom	Reactant	Product
Sodium (Na)	1	1
Oxygen (O)	1	1
Hydrogen (H)	2	3

• Balance the equation by multiplying water and Sodium by 2 on the reactant side and Sodium hydroxide by 2 on the product side.

Atom	Reactant	Product
Sodium (Na)	2	2
Oxygen (O)	2	2
Hydrogen (H)	4	4

$\underset{\mathrm{Sodium}}{2\mathrm{Na}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}\to \underset{\mathrm{Sodium}\mathrm{hydroxide}}{2\mathrm{NaOH}\left(\mathrm{l}\right)}+\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}+\mathrm{Heat}$