# How do you write a balanced reaction for magnesium with hydrochloric acid?

Nov 19, 2015

The priority is to write a stoichiometric equation that is balanced with respect to mass and charge.

#### Explanation:

The metal is sufficiently active so as to reduce hydrogen ion.

And we could use half-equations....i.e.

$M g \left(s\right) \rightarrow M {g}^{2 +} + 2 {e}^{-}$...with an accompanying reduction...

${H}^{+} + {e}^{-} \rightarrow \frac{1}{2} {H}_{2} \left(s\right)$

And we takes one of the former and add it TWO of the latter to give....

$M g \left(s\right) + 2 H C l \left(a q\right) \rightarrow M g C {l}_{2} \left(a q\right) + {H}_{2} \left(g\right) \uparrow$