Question

Question #f421c

Answer 1

To write the complete ionic equation:

Start with a balanced molecular equation.
Break all soluble strong electrolytes (compounds with (aq) beside them) into their ions
indicate the correct formula and charge of each ion
indicate the correct number of each ion
write (aq) after each ion
Bring down all compounds with (s), (l), or (g) unchanged.

`Mg_((s))+ 2HCl_((aq))rarrMgCl_(2(aq))+H_(2(g))`
( molecular equation)

How did I get this equation??? Consider each reactant or product separately:

1 mole of HCl contains 1 moles of `H^+` and 1 mole of `Cl^-` .
2 moles of HCl contains 2 moles of `H^+` and 2 mole of `Cl^-` .

Mg (s) + 2 HCl (aq) -----> Mg`Cl_2` (aq) + `H_2` (g)

Mg (s) + 2 `H^+` (aq) + 2 `Cl^-` (aq) ------> Mg`Cl_2` (aq) + `H_2` (g)

Another example:

video from: Noel Pauller