Christmas Ornaments Made with Acid

 

Science doesn't stop during the holidays and one of the things we do in chemistry to remind students that chemistry is all around is to make Christmas Ornaments using Chemistry - specifically chemical reactions involving acid and plating metal with acidified metal ions.

 

We start off with some galvanized iron, which is just iron coated with zinc. The zinc used to protect the iron (or steel) from rusting. Hydrochloric acid will dissolve the zinc from the top of the metal, exposing the iron. The iron will then be coated with copper to make the copper and silver looking ornament.

 

How to make a Christmas Tree Ornament using Hydrochloric Acid and Galvanized Metal

Supplies

 

Directions

  1. Cut the metal into any shape you'd like (we cut 2.5 inch squares)

    • *Choose galvanized sheets that are 26 gauge or higher. The higher the gauge number the thinner the sheets. Any below 26 is very difficult to cut. We recommend 28 or 30 gauge)

  2. Cover both sides completely with masking tape

  3. Draw a design on the tape or trace a design

  4. Cut out the design using an X-acto knife or utility knife

  5. Remove tape in areas you want to be copper colored when finished; leave tape in areas you want to remain shiny silver color.

  6. Set the metal ornament in a 6 Molar hydrochloric acid bath (3 Molar will work but will take longer). [Muriatic Acid is an acceptable substitute and is available at many hardware stores]

  7. Carefully remove using tongs or tweezers

  8. Rinse with water (distilled water if available)

  9. Dry completely

  10. Completely coat the exposed areas (areas with no tape) with Acidified Copper(II) Nitrate by brushing the solution on with a cotton swab

  11. Allow to dry

  12. Remove the tape

  13. Punch a hold in the metal with a metal punch or using a nail and hammer

  14. Attach a hook or bent paper clip

 

Chemical Reactions

Zinc reacts with hydrochloric acid causing zinc chloride and hydrogen gas to form (caution: hydrogen gas is highly reactive and flammable!)

 

Zn(s) + 2HCl(aq) -> ZnCl2(aq) + H2(g)

 

Iron reacts with acidified copper(II) nitrate which deposits a thin layer of copper on the zinc. This is called metal plating.

 

Fe(s) + Cu(NO3)2(aq) -> Fe(NO3)2(aq) + Cu(s)

 

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Craig Beals  |  Craig@BealsScience.com 

© 2019 Beals Science, LLC | United States

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