Question

Mg(s)+2HCl(aq)  →  MgCl2(aq)+H2(g)

Answer 1

Answer:

$Mg(s)+2H^+(aq)\rightarrow Mg^{2+}(aq)+H_2(g)$

Explanation:

Hello!

In this case, since the writing of a net ionic equation first implies writing the complete molecular equation:

$Mg(s)+2HCl(aq) \rightarrow MgCl_2(aq)+H_2(g)$

We can see that HCl and MgCl2 are ionized because they are aqueous, thus we write:

$Mg(s)+2H^+(aq)+2Cl^-(aq) \rightarrow Mg^{2+}(aq)+2Cl^-(aq)+H_2(g)$

In such a way, we can cancel out the chloride ions as they are the spectator ones to obtain the net ionic one:

$Mg(s)+2H^+(aq)\rightarrow Mg^{2+}(aq)+H_2(g)$

Best regards!