The balanced reaction is Al(s) + 3CuCl₂(aq) → 3Cu(s) + 2AlCl₃(aq) when aluminum reacts with copper 2 chloride to make aluminum chloride and copper.
What is a balanced chemical equation?
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charges are the same for both the reactants and the products.
Reactants are:
Al(s) and CuCl₂ (aq)
Products are:
Cu(s) and AlCl₃
This is a redox reaction where the Al and the Cu, change the oxidation state.
Al(s) → Al³⁺ + 3e⁻ ⇒ Oxidation
Cu²⁺(aq) + 2e⁻ → Cu(s) ⇒ Reduction
We multiply both reactions, in order to have the electrons balanced:
(Al(s) → Al³⁺ + 3e⁻ )2 ⇒ 2Al(s) → 2Al³⁺ + 6e⁻
(Cu²⁺(aq) + 2e⁻ → Cu(s) ) .3 ⇒ 3Cu²⁺(aq) + 6e⁻ → 3Cu(s)
We sum both half-reactions, to cancel the electrons:
2Al(s) + 3Cu²⁺(aq) + 6e⁻ → 3Cu(s) + 2Al³⁺ + 6e⁻
We add the chlorides, to get the balanced reaction.
Hence, the balanced reaction is:
Al(s) + 3CuCl₂(aq) → 3Cu(s) + 2AlCl₃(aq)
Learn more about balanced chemical equations here:
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