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ycow [4]
3 years ago
8

Which reaction occurs at the cathode of a lead-storage battery that is being recharged?

Chemistry
1 answer:
Alekssandra [29.7K]3 years ago
4 0
Reaction on positive electrode (cathode):
PbSO₄₍s₎ + 2H₂O₍l₎ → 2e⁻ + PbO₂₍s₎ + 4H⁺₍aq₎ + SO₄²⁻₍aq₎.
s - solid.
l - liquid.
aq - dissolve in water.
PbSO4 is converted to Pb at one electrode (anode) and to PbO₂ at the other (cathode). Lead battery can be recharged, during recharging, an external source of energy is used.
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The edge length of the unit cell of KCl (NaCl-like structure, FCC) is 6.28 Å. Assuming anion-cation contact along the cell edge,
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Answer:

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Also, the sum of the radius of the cation and the anion in FCC is equal to half of the edge length.

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<u>Size of the potassium ion = 1.33 Å</u>

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