A tiny piece that magnesium ribbon is put in a Petri dish containing 1M hydrochloric acid. Because that a big audience presentation, this demonstration should be regarded via a camera or document camera. Students observe bubbles of hydrogen gas forming.

You are watching: What happens when magnesium reacts with hydrochloric acid

There are countless places in the curriculum whereby this demonstration might be used. It is most generally used when stating the characteristic reaction of either steels or acids. It's additionally a great example the a single replacement reaction (an oxidation-reduction reaction) when discussing types of reactions. This demonstrate may likewise be performed using a paper projector if a dark elevator is used. Allow about 5 minutes because that this demo. A computer simulation is obtainable to compliment and also enhance this demonstration.

Learning Objectives

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

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

3. Compose a well balanced chemical equation and also a network ionic equation.

One work of lead time is compelled for this project.
Discussion

Magnesium reacts through hydrochloric acid according come 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 solitary replacement reaction, or to show the generation of hydrogen gas. The flammability of hydrogen gas can be prove by very 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 for 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 the 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 about 5 mm. Utilizing forceps, ar the magnesium ribbon into the Petri dish. The magnesium reacts through the acid, creating visible balloon of hydrogen gas.

(Optional) If the fire of a butane fireplace lighter is held over the bursting bubbles, they will create audible pops together the hydrogen ignites.

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

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