: The electrolytic solution used in a hydrogen-oxygen fuel cell is
25% NaOH solution
25% KOH solution
75% KOH solution
75% NaOH solution
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Answers
Fuel cells:
A hydrogen-oxygen fuel cell consists of an electrolyte solution, such as KOH solution and two inert carbon electrodes. Hydorgen and oxygen gases are bubbled through the anode and cathode compartments, where the following reactions takes place.
At anode: 2H
2
(g)+4OH
−
→4H
2
O(l)+4e
−
At cathode: O
2
(g)+2H
2
O(l)+4e
−
→4OH
−
_____________________________________
Net cell reaction: 2H
2
(g)+O
2
(g)→2H
2
O(l)
The standard emf of the cell is 1.23V, which indicates that the cell reaction is spontaneous under standard conditions. The porous carbon electrodes serve as electrical conductors and also provide the necessary surfaces for the initial decomposition of the molecules into atomic species, prior to electron transfer. A hydrogen-oxygen fuel cell assembly is shown in Figure.
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Answer:
This concentration of KOH provides the best balance between ionic conductivity and oxygen solubility, resulting in optimal fuel cell performance.
Explanation:
The correct electrolytic solution used in a hydrogen-oxygen fuel cell is 75% KOH solution.
A hydrogen-oxygen fuel cell works by electrochemically combining hydrogen and oxygen to produce electricity, water, and heat. The fuel cell contains an anode and a cathode separated by an electrolyte. The electrolyte allows ions to pass between the anode and cathode while preventing the gases from mixing.
In a hydrogen-oxygen fuel cell, potassium hydroxide (KOH) or sodium hydroxide (NaOH) solutions are commonly used as the electrolyte. The concentration of the solution affects the performance of the fuel cell. Typically, a 25% to 75% concentration of KOH or NaOH is used.
However, a 75% KOH solution is the most commonly used electrolytic solution in a hydrogen-oxygen fuel cell. This concentration of KOH provides the best balance between ionic conductivity and oxygen solubility, resulting in optimal fuel cell performance.
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