A little piece the magnesium ribbon is put in a Petri dish containing 1M hydrochloric acid. For a huge audience presentation, this demonstration should be regarded via a camera or record camera. Students watch bubbles the hydrogen gas forming.

You are watching: Mg + hcl net ionic equation

There are many places in the curriculum wherein this demonstration might be used. The is most frequently used when pointing out the characteristic reaction of either metals or acids. It's additionally a great example of a solitary replacement reaction (an oxidation-reduction reaction) as soon as discussing species of reactions. This demonstrate may likewise be performed making use of a file projector if a dark lift is used. Allow around 5 minutes for this demo. A computer simulation is easily accessible to compliment and enhance this demonstration.

Learning Objectives

1. Magnesium metal is an energetic metal. Magnesium will react through hydrochloric acid.

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

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

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

Magnesium reacts v hydrochloric acid according come the equation: Mg(s) + 2 HCl(aq) -->MgCl2(aq) + H2(g) This demonstration have the right to be supplied to illustrate the characteristics reaction of steels with acid, a single replacement reaction, or to demonstrate the generation the hydrogen gas. The flammability that hydrogen gas can be prove by carefully holding a match or fireplace lighter up to the popping hydrogen bubbles. An audible crackling sound is heard as the hydrogen burns.

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

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

Mechanics that presenting this demonstration

Turn ~ above the camera and focus it. Ar the Petri dish on the overhead projector. To water hydrochloric acid right into the Petri food to a depth of around 5 mm. Making use of forceps, place the magnesium ribbon right into the Petri dish. The magnesium reacts v 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 develop 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 supplied in or produced by this demo present tiny hazard. Wear safety and security goggles. Save flammables and also open flame away from the vicinity that the demo.

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


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