A tiny piece the magnesium ribbon is put in a Petri food containing 1M hydrochloric acid. Because that a big audience presentation, this demonstration need to be regarded via a camera or file camera. Students watch bubbles the hydrogen gas forming.

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There are countless places in the curriculum wherein this demonstration can be used. It is most commonly used when pointing out the characteristic reaction of either metals or acids. It's additionally a an excellent example the a solitary replacement reaction (an oxidation-reduction reaction) when discussing types of reactions. This demonstrate may likewise be performed making use of a document projector if a dark lift is used. Allow about 5 minutes because that this demo. A computer simulation is obtainable to compliment and enhance this demonstration.

Learning Objectives

1. Magnesium steel is an energetic metal. Magnesium will react with hydrochloric acid.

2. Illustration that a single displacement reaction. Illustration of one oxidation-reduction reaction. Illustration of a reaction that produces a gas.

3. Write a balanced chemical equation and also a network ionic equation.


Lead Time
One work of command time is required for this project.
Discussion

Magnesium reacts with hydrochloric mountain according to the equation: Mg(s) + 2 HCl(aq) -->MgCl2(aq) + H2(g) This demonstration can be used to highlight the characteristic reaction of steels with acid, a single replacement reaction, or to show the generation the hydrogen gas. The flammability that hydrogen gas deserve to be demonstrated by closely holding a enhance or fireplace lighter approximately the popping hydrogen bubbles. One audible crackling sound is heard together the hydrogen burns.

The network ionic equation because that this reaction is:Mg(s) + 2H+(aq) -->Mg2+(aq) +H2(g)


Petri dish1cm strip of magnesium ribbonwash party containing 1M HClforcepsoverhead projector(Optional) butane fireplace lighter

Mechanics that presenting this demonstration

Turn ~ above the camera and also focus it. Location the Petri dish on the overhead projector. Pour hydrochloric acid right into the Petri food to a depth of about 5 mm. Utilizing forceps, place the magnesium ribbon into the Petri dish. The magnesium reacts v the acid, developing visible bubbles of hydrogen gas.

(Optional) If the flame of a butane fireplace lighter is held over the bursting bubbles, lock will produce audible pops as the hydrogen ignites.


Magnesium ribbon is a flammable solid. Hydrochloric mountain is a corrosive liquid. Hydrogen gas is explosive. However, the very tiny quantities and also low dilutions used in or developed by this demo present small hazard. Wear safety and security goggles. Store flammables and also open flame far from the vicinity of the demo.


1. B.Z. Shakhashiri;Chemical Demonstrations: A Handbook for Teachers the Chemistry; Wisconsin; 1985; Volume 1; p. 25-26.


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