The electrolyte solution in a zinc-air battery (Figure 13.16) is aqueous KOH. For a zinc-air battery to obtain O₂ from the air, there are tiny openings in the battery. However, these openings also allow water vapor to escape and enter the battery as the humidity changes. The optimum relative humidity for efficient zinc-air battery function, at which the KOH electrolyte is in equilibrium with water in the surrounding air, is 60% at 25°C. On the molecular level, describe what will happen to a zinc-air battery if used consistently in 

(a) An arid environment and

(b) An extremely humid environment.

Figure 13.16

Transcribed Image Text:

Cathode can Anode can Air access hole Air distribution membrane Hydrophobic Teflon layer Nickel-plated screen Insulator Zinc anode and potassium hydroxide electrolyte