A little piece of magnesium ribbon is placed in a Petri food containing 1M hydrochloric acid. For a big audience presentation, this demonstration need to be viewed via a camera or record camera. Students watch bubbles of hydrogen gas forming.

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There are countless places in the curriculum where this demonstration can be used. It is most typically used when stating the characteristic reactions of either steels or acids. It's also a good example the a solitary replacement reaction (an oxidation-reduction reaction) as soon as discussing varieties of reactions. This show may likewise be performed using a record projector if a dark lift is used. Allow about 5 minutes because that this demo. A computer system simulation is easily accessible to compliment and enhance this demonstration.

Learning Objectives

1. Magnesium metal is an active metal. Magnesium will react with hydrochloric acid.

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

3. Create a balanced chemical equation and also a net ionic equation.


Lead Time
One job of lead time is compelled for this project.
Discussion

Magnesium reacts through hydrochloric mountain according come the equation: Mg(s) + 2 HCl(aq) -->MgCl2(aq) + H2(g) This demonstration deserve to be provided to highlight the characteristics reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas. The flammability the hydrogen gas deserve to be demonstrated by carefully holding a enhance or fireplace lighter as much as the popping hydrogen bubbles. One audible crackling sound is heard as 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 bottle containing 1M HClforcepsoverhead projector(Optional) butane fireplace lighter

Mechanics that presenting this demonstration

Turn ~ above the camera and also focus it. Place the Petri dish on the overhead projector. Pour hydrochloric acid into the Petri dish to a depth of around 5 mm. Making use of forceps, ar the magnesium ribbon into the Petri dish. The magnesium reacts through the acid, producing visible bubbles of hydrogen gas.

(Optional) If the fire 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 acid is a corrosive liquid. Hydrogen gas is explosive. However, the very small quantities and also low dilutions used in or produced by this demo present tiny hazard. Wear safety goggles. Keep flammables and open flame away from the vicinity that the demo.


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


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