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Collecting Hydrogen Gas by Upward Delivery

Collecting Hydrogen Gas by Upward Delivery

C039/1243

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Credit

TURTLE ROCK SCIENTIFIC / SCIENCE PHOTO LIBRARY TURTLE ROCK SCIENTIFIC / SCIENCE PHOTO LIBRARY

Caption

Collecting hydrogen gas by upward delivery. Zinc metal (Zn) coils are placed in an Erlenmeyer flask with 1 M sulfuric acid (H2SO4). Hydrogen gas (H2) is produced in the reaction: Zn + H2SO4 -> ZnSO4 + H2. Hydrogen gas is lighter (less dense) than air. Therefore it raises into an inverted test tube and displaces the more dense air downwards. This method of gas collection is called upward delivery.

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