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25 June, 16:13

Student reacts with a piece of copper with a silver nitrate solution in a single replacement reaction. Write and balance the equation for this reaction.

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  1. 25 June, 17:25
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    Cu (s) + 2AgNO₃ (aq) → 2Ag (s) + Cu (NO₃) ₂ (aq)

    Explanation:

    Reactants: Cu (s), AgNO₃ (aq)

    This is a redox reaction, where the Ag and the Cu change the oxidation state

    Ag, from + 1 to 0 → reduction

    Cu, from 0 to + 2 → oxidation

    Ag⁺ + 1e⁻ → Ag Reduction gains an electron

    Cu → Cu²⁺ + 2e⁻ Oxidation releases 2 electrons

    We multiply the half reactions:

    (Ag⁺ + 1e⁻ → Ag). 2 = 2Ag⁺ + 2e⁻ → 2Ag

    (Cu → Cu²⁺ + 2e⁻). 1 = Cu → Cu²⁺ + 2e⁻

    We sum both reaction, so we cancel the e⁻:

    2Ag⁺ + 2e⁻ + Cu → 2Ag + Cu²⁺ + 2e⁻

    We add the other ions, to get the balanced equation:

    Cu (s) + 2AgNO₃ (aq) → 2Ag (s) + Cu (NO₃) ₂ (aq)
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