Daniell Cell (Zn–Cu Galvanic Cell)

Also called

daniell cell · galvanic cell · voltaic cell · electrochemical cell · electrochemical cells · zinc copper cell · zn cu cell · salt bridge · anode and cathode · oxidation and reduction · redox reaction · electrode potential · cell emf · emf of a cell · nernst equation · standard electrode potential · electrochemistry · half cell · zinc sulfate copper sulfate · electron flow · ion migration · potassium nitrate salt bridge · cell potential

Topics

• Anode (oxidation): Zn(s) → Zn²⁺(aq) + 2e⁻. Cathode (reduction): Cu²⁺(aq) + 2e⁻ → Cu(s). Overall: Zn + Cu²⁺ → Zn²⁺ + Cu.
• Electrons flow only through the external metal path, from zinc to copper…
• One copper atom is deposited for each zinc atom oxidised, and each needs two electrons…
• The salt bridge sends NO₃⁻ into the zinc half-cell and K⁺ into the copper half-cell…
• Without the bridge (or with the switch open) a charge imbalance builds up within moments and the current stops.
• In a galvanic cell the anode is negative and the cathode positive…
• Nernst equation at 298.15 K: E = E° − (RT/2F) ln(a(Zn²⁺)/a(Cu²⁺))…
• Raising a(Zn²⁺)/a(Cu²⁺) lowers the emf: Q = 1 → 1.100 V, Q = 10 → 1.070 V, Q = 100 → 1.041 V, Q = 0.1 → 1.130 V…

About this model

A GLB file of about 412 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Beaker mesh: "Lab assets" by MilkAndBanana (OpenGameArt), CC0 1.0. Everything else (electrodes, solutions, salt bridge, circuit, voltmeter, particles and animation) is original Lably content. | CC0 1.0 (beaker mesh); original Lably content

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