A small piece the magnesium ribbon is placed in a Petri dish containing 1M hydrochloric acid. For a large audience presentation, this demonstration must be viewed via a camera or paper camera. Students observe bubbles that hydrogen gas forming.

You are watching: Balanced equation for magnesium and hydrochloric acid

There are many places in the curriculum whereby this demonstration could be used. It is most typically used when mentioning the characteristic reaction of either metals or acids. It's also a great example of a solitary replacement reaction (an oxidation-reduction reaction) as soon as discussing species of reactions. This show may also be performed making use of a document projector if a dark background is used. Allow around 5 minutes because that this demo. A computer system simulation is easily accessible to compliment and enhance this demonstration.

Learning Objectives

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

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

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

Lead Time
One job of command time is forced for this project.

Magnesium reacts v hydrochloric mountain according to the equation: Mg(s) + 2 HCl(aq) -->MgCl2(aq) + H2(g) This demonstration deserve to be offered to highlight the characteristics reaction of metals with acid, a solitary replacement reaction, or to demonstrate the generation of hydrogen gas. The flammability that hydrogen gas can be demonstrated by carefully holding a complement or fireplace lighter as much as 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 piece of magnesium ribbonwash party containing 1M HClforcepsoverhead projector(Optional) butane fireplace lighter

Mechanics that presenting this demonstration

Turn on the camera and focus it. Location the Petri dish on the overhead projector. Pour hydrochloric acid right into the Petri dish to a depth of about 5 mm. Making use of forceps, place the magnesium ribbon right into the Petri dish. The magnesium reacts through the acid, creating visible bubbles of hydrogen gas.

(Optional) If the fire of a butane fireplace lighter is held above the bursting bubbles, castle will produce audible pops together the hydrogen ignites.

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