Question

Complete and balance the following equation.

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

Answer 1

Balance the equation - $\mathrm{Na}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to 2\mathrm{NaOH}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)\uparrow$

• To balance the chemical equation elements of each molecule both reactant and product sides should be equal.
• By trial method using number coefficient is used to balance each atom.

Reactant side Product side

Na = 1 x 2 Na = 1 x 2

H = 2 x 2 H = 2 x 1 + 2 x 1

O = 1 x 2 O = 1 x 2

Therefore balanced equation = $2\mathrm{Na}\left(\mathrm{s}\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\to 2\mathrm{NaOH}\left(\mathrm{aq}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)\uparrow$