Annode Oxidation Gain of oxygen
Loss of hydrogen
Loss of 𝒆
+𝑒 in products
Oxidation StrongestReductant
Anode Corrodes Faster
REDuction CAThode
Loss of oxygen Gain of hydrogen
Gain of 𝒆 +𝑒 in reactants
Reduction StrongestOxident
Cathode 𝒆 →→
Voltaic Cell Spontaneous
Negative Electrode HASLower E0
E0 x-1 Solid forms (plating)
Positive Electrode HASHigest E0
←← 𝑃𝑜𝑠𝑖𝑡𝑖𝑣𝑒 𝐼𝑜𝑛𝑠 (𝐶𝑎𝑡𝑖𝑜𝑛𝑠) 𝐴+ 𝐴−𝑁𝑒𝑔𝑎𝑡𝑖𝑣𝑒 𝐼𝑜𝑛𝑠 (𝐴𝑛𝑖𝑜𝑛𝑠) →→
Zn s |Zn(NO3)2 aq ||Cu(NO3)2 aq |Cu(s)
Electrolytic Cells Non Spontaneous
Positive Electrode Highest E0
E0 x-1 Becomes basic 𝑝𝐻 ↑
Negative Electrode Lowest E0
GOES AS PREDICTED
Becomes acidic 𝑝𝐻 ↓ Solid forms on electrode
𝐴+𝑃𝑜𝑠𝑖𝑡𝑖𝑣𝑒 𝐼𝑜𝑛𝑠 (𝐶𝑎𝑡𝑖𝑜𝑛𝑠) →→ ←← 𝑁𝑒𝑔𝑎𝑡𝑖𝑣𝑒 𝐼𝑜𝑛𝑠 (𝐴𝑛𝑖𝑜𝑛𝑠) 𝐴−
H2O2 ∶ O = −1 CuH2: H = −1 Cl=-1 Br=-1 H=+1 O=-2 Ag=+1
K Na Li Ba Ca Mg Al Zn Fe Ni Sn Pb H2 Cu Ag Hg
←strongest REDUCTANT weakest→ 𝑤𝑜𝑛𝑡 𝑟𝑒𝑎𝑐𝑡 𝑤𝑖𝑡ℎ 𝑎𝑐𝑖𝑑 ← 𝐻2 → will react