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If we connect an electrolyzer filled
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with distilled water to a source of direct current,
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we can observe a slow evolution of gases.
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After some time, we notice that the volume of the gas
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released at the cathode is double that of the gas
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formed at the anode.
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To identify the gassiest products of the reaction,
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we collect each gas in and check its behavior
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in the presence of a glowing splint.
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The characteristic cracking sound proves that
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the gas released at the cathode is hydrogen.
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The ignition of the glowing splint is evidence of the gas
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collected from the anode is oxygen,
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which supports combustion.