Chemistry / Chem 1276 · Atom · ~20 seconds
Collecting a Gas Over Water
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A gas collected by bubbling it into an inverted, water-filled container becomes mixed with water vapor, so the trapped gas's total pressure includes both.
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Hydrogen collected over water at a measured total pressure is mixed with whatever water vapor pressure applies at that temperature.
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The measured total pressure overstates the collected gas's own pressure until the water vapor's contribution is subtracted out.