Young World

As good as new

Ask your parents to give you dull or stained coins they have and try this experiment using everyday kitchen ingredients.

What you need

> A dull coin

>A glass

>Some vinegar – about 1⁄4

>cup

>1 tablespoon of salt

>Spoon

What to do

Pour the vinegar into the glass and add salt. Using a spoon, stir the salt till it has dissolved. Now, put the coin into the vinegar and salt solution and leave it there for about 20 minutes. You can leave it there longer if you want.

Now take out the coin from the vinegar-salt solution using a spoon and wash it in running water. It is okay to use your hands to remove the coin, but if you have any cuts or sores on your hands, dipping it in may sting. Therefore, we recommend using a spoon.

Made new

The coin should be shiny again. For really tough stains, try using an old toothbrush after the coin has been in the vinegar-salt solution for 20 minutes. You will have a new-looking coin!

For some added fun, try cleaning your coins with tomato sauce or Tabasco sauce, both of which contain a combination of vinegar and salt. Other ways to clean dull coins are using colas or a solution of vinegar and baking soda. You could also try using lemon or orange juice instead of vinegar.

What really happens:

When salt and vinegar are mixed together, a dilute solution of hydrochloric acid as well as sodium acetate is formed. Hydrochloric acid is often used to clean metals and metallic objects. Your coins are made of copper (if you are using a five rupee coin) or steel (if you are using one of the newer coins), both of which are metals.

Write in to us at thesciencefactory@outlook.com if you come up with more interesting ways to shine your coins.

Courtesy: The Science Factory, a scientific enrichment programme for kids. www.thesciencefactory.in


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Printable version | Nov 30, 2021 6:47:19 PM | https://www.thehindu.com/features/kids/as-good-as-new/article6570242.ece

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