Mg metal is introduced in Hcl soluon.1.Write two half equations
2.Write overall equation
To write the half-equations and the overall equation for the reaction between Mg metal and HCl solution, we need to understand the concept of redox reactions. In redox reactions, one species loses electrons (oxidation) while another species gains electrons (reduction).
1. Writing the half-equations:
First, let's identify the oxidation and reduction half-reactions.
Oxidation Half-Reaction:
When Mg metal reacts, it loses electrons and gets oxidized. The oxidation state of Mg changes from 0 to +2.
Mg → Mg2+ + 2e-
Reduction Half-Reaction:
HCl solution contains H+ ions which can gain electrons to get reduced.
2H+ + 2e- → H2
2. Writing the overall equation:
To get the overall equation, we need to balance the number of electrons transferred in the two half-reactions.
Multiply the oxidation half-reaction by 2 to equalize the number of electrons:
2Mg → 2Mg2+ + 4e-
Now, add the two half-equations together:
2Mg + 2H+ → 2Mg2+ + H2
Thus, the overall equation for the reaction between Mg metal and HCl solution is:
2Mg + 2HCl → 2MgCl2 + H2