Hydrogen : Place 25 mL of 2 Molar Hydrochloric acid in a 125-mL Erlenmeyer flask
ID: 557456 • Letter: H
Question
Hydrogen: Place 25 mL of 2 Molar Hydrochloric acid in a 125-mL Erlenmeyer flask. Add 4 or 5 magnesium turnings (individual pieces) and immediately place the stopper/tubing assembly in the mouth of the flask. Position the rubber tubing under the mouth of the cylinder you are using to collect the gas. When the reaction is complete, and while keeping the graduated cylinder upside down, bring the burning wood splint ‘just’ inside the mouth of the graduated cylinder.
Observations:
Effect of gas on burning wood splint:
Explanation / Answer
Observation: bubbling occurs due to evolition of a colorless and odorless gas. The gas is hydrogen.
Reaction: 2HCl + Mg = MgCl2 + H2
Effect of gas on burning wood splint:hydrogen is flamable and it catches fire from burning wood splint.
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