Send us your questions

Some of our visitors have sent emails with interesting questions, we decided to start having a space to answer them. In this space the blog "Restless Minds" will answer all questions you send us
Send us your question for the email: Restless Minds.

Science progress affects our daily life and "to know" means you are going to chose right, because it allows you to form your own opinion on scientific everyday issues. On the other hand, having an elegant and harmonious vision of the world where we live in leads to a feeling of intellectual satisfaction.
We believe this kind of scientific day to day knowledge should be encouraged from an early age, and that's why this project was born: science, culture, knowledge, crafts for your restless mind.

Wednesday, December 28, 2011

Cleanning pennies

A penny is a penny, but we can make them shiny and clean with a little help of chemistry. This is another demonstration using vinegar.

NOTE: Don’t use this method to clean collection coins, this can damage the coin. If you have collector coins or valuable items ask a specialist how to clean them.

What we need:

  • pennies,
  • vinegar,
  • salt,
  • a jar, with lid
  • tablespoon,
  • paper napkin.
How to:
  1. Mix 2inches of vinegar with 1 tablespoon of salt in the flask;
  2. Close the flask;
  3. Stir to dissolve the salt;
  4. Open the flask and place 2 or 3 coins inside;
  5. Close it again;
  6. Wait 1 or 2 minutes;
  7. Open and remove the coins, be careful with vinegar smell;
  8. Place the coins in the paper napkin to dry;
What happens?
The coins become clean and shiny
Why?
The solution we made with the salt and the vinegar released the residues of the coins, and the coins become clean as new.
This residue is copper oxide, this oxide reacts with the vinegar (acetic acid) and the reaction product remains suspended on vinegar.

Et Voil√°!
Clean as new

 
Enjoy!


    No comments:

    Related Posts Plugin for WordPress, Blogger...