Answer:
MgCl₂ and H₂
Step-by-step explanation:
The reaction between Magnesium and Hydrochloric acid is a single replacement reaction. In a single replacement, a metallic ion replaces another ion based on their positions in the activity series.
The reaction can be written as:
Mg + HCl → ?
The ionic form can be written as:
Mg + H⁺ + Cl⁻ → ?
Now lets look at the reaction halves:
Mg → Mg²⁺ + 2e⁻ This is an oxidation half in which 2e⁻ is lost
2H⁺ + 2e⁻ → H₂ This is a reduction half in which 2e⁻ is gained
In the activity series, Mg is higher up and is able to replace the hydrogen ions that in the lower part of the series.
Combining both reaction halves, we have:
Mg + 2H⁺ → Mg²⁺ + H₂
If we include the spectator ions we have:
Mg + 2HCl → MgCl₂ + H₂