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13 cards from this deck
Water produces H⁺ and OH⁻ ions that react at electrodes
H⁺ (hydrogen ions) and OH⁻ (hydroxide ions)
\ceH2O(l)<=>H+(aq)+OH−(aq)\ce{H2O(l) <=> H+(aq) + OH-(aq)}\ceH2O(l)<=>H+(aq)+OH−(aq)
The less reactive ion
The ion that can be oxidised more easily
Cu²⁺ (copper is less reactive than hydrogen)
Solid copper deposits on cathode
\ceCu2+(aq)+2e−−>Cu(s)\ce{Cu^{2+}(aq) + 2e- -> Cu(s)}\ceCu2+(aq)+2e−−>Cu(s)
OH⁻ ions (from water)
\ce4OH−(aq)−>2H2O(l)+O2(g)+4e−\ce{4OH-(aq) -> 2H2O(l) + O2(g) + 4e-}\ce4OH−(aq)−>2H2O(l)+O2(g)+4e−
Oxygen gas (O₂) and water
They remain; H⁺ ions reduced instead
Halide ions (e.g. Cl⁻)
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