A tiny piece that magnesium ribbon is put in a Petri dish containing 1M hydrochloric acid. Because that a big audience presentation, this demonstration have to be perceived via a camera or paper camera. Students observe bubbles the hydrogen gas forming.

You are watching: Net ionic equation for magnesium and hydrochloric acid

There are countless places in the curriculum where this demonstration could be used. It is most frequently used when discussing the characteristic reactions of either steels or acids. It's also a good example of a single replacement reaction (an oxidation-reduction reaction) as soon as discussing types of reactions. This demonstration may additionally be performed utilizing a document projector if a dark elevator is used. Allow about 5 minutes because that this demo. A computer system simulation is easily accessible to compliment and also enhance this demonstration.

Learning Objectives

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

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

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

Lead Time
One day of lead time is forced for this project.

Magnesium reacts v hydrochloric acid according to the equation: Mg(s) + 2 HCl(aq) -->MgCl2(aq) + H2(g) This demonstration deserve to be used to illustrate the properties reaction of metals with acid, a solitary replacement reaction, or to demonstrate the generation the hydrogen gas. The flammability that hydrogen gas deserve to be prove by very closely holding a complement or fireplace lighter approximately 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 party containing 1M HClforcepsoverhead projector(Optional) butane fireplace lighter

Mechanics the presenting this demonstration

Turn top top the camera and focus it. Location the Petri dish on the overhead projector. Pour hydrochloric acid into the Petri dish to a depth of about 5 mm. Using forceps, place the magnesium ribbon into the Petri dish. The magnesium reacts with 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 as 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 offered in or developed by this demo present little hazard. Wear safety goggles. Save flammables and 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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