# Problem: Identify the atoms that are oxidized and reduced, the change in oxidation state for each, and the oxidizing and reducing agents in each of the following equations:(a) Mg(s) + NiCl2(aq) ⟶ MgCl2(aq) + Ni(s)

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###### FREE Expert Solution

To determine which element is reduced or oxidized, we must identify the changes in their oxidation states. Compare the oxidation number of the element on the reactant side and on the product side.

Remember the mnemonics:

Loss                Gain

Electrons         Electrons

Oxidation         Reduction

Reaction:

Mg(s) + NiCl2(aq) ⟶ MgCl2(aq) + Ni(s)

Recall the rules for the oxidation states of some elements

Reactants:

Mg(s) → Standard state → O.S = 0

• NiCl2(aq) →

Cl → Group 7A →  O.S = -1

▪ overall oxidation state of NiCl2= 0 (neutral compound)

oxidation state of Ni + 2 oxidation state of Cl = 0

Ni + 2(-1) = 0

Ni  -2  = 0

Ni  → O.S = +2

Products:

MgCl2(aq)

•  Cl → Group 7A →  O.S = -1
• overall oxidation state of MgCl2= 0 (neutral compound)
• oxidation state of Mg + 2 oxidation state of Cl = 0
Mg + 2(-1) = 0
Mg  -2  = 0
Mg  → O.S = +2

Ni(s) → Standard state → O.S = 0 ###### Problem Details

Identify the atoms that are oxidized and reduced, the change in oxidation state for each, and the oxidizing and reducing agents in each of the following equations:

(a) Mg(s) + NiCl2(aq) ⟶ MgCl2(aq) + Ni(s)