Photo: Huy Phan

Why does ketchup clean pennies the best?

Ketchup contains vinegar, a weak acid, which breaks down the copper oxide on the surface of the penny. The salt in the ketchup goes on to add dissolved chloride ions to the mix. These ions bond with the copper, forming copper chloride. The copper chloride helps the vinegar further break down the copper oxide.

thinkstretch.com - Cleaning Pennies with Condiments - ThinkStretch

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Take the little coins from the bottom of your piggy bank and combine them with the tasty sauces on your hot dog and hamburgers. What do you get? Well, we can’t tell you now, since that would ruin the surprise!

What you need:

Dirty pennies

Small cups

Water

Ketchup

Other condiments (mustard, mayonnaise, barbecue sauce, etc.)

Paper towel or napkins

What you do:

Make sure you have as many pennies and small cups as you have condiments to test. First, fill the small cups up with your condiments, including one for ketchup and one for water. The water cup will represent our control cup that we can compare the other variables to. Observe how the pennies look and feel before placing them into the cups. After noting your observations, place one penny in each cup. The penny should be completely submerged in each of the cups. Leave to soak for 5 minutes. Fish the pennies out of the cups and wipe them off with a paper towel or napkin.

Questions to consider:

How do the pennies look different from what they looked like before? What condiment cleaned the penny the best? Why do you think this happened?

Why it works:

Pennies are made of copper and become dirty when copper oxide forms on their surface.This is caused by oxygen in the air reacting with the copper inside the penny, causing new shiny pennies to dull over time. In order to clean the coins, we have to use a chemical reaction. The best way to do this is with an acid and salt. Ketchup contains vinegar, a weak acid, which breaks down the copper oxide on the surface of the penny. The salt in the ketchup goes on to add dissolved chloride ions to the mix. These ions bond with the copper, forming copper chloride. The copper chloride helps the vinegar further break down the copper oxide. Basically, the vinegar is the cleaning agent and the salt gives it speed. This is why the penny in the ketchup turned out so much cleaner than the other condiments and water, which do not contain these elements.

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What pennies are collectors looking for?

List of 25 Most Valuable US Pennies 1.) 1944 Steel Wheat Penny - $408,000. 2.) 1943 Copper Wheat Penny - $250,000. 3.) 1856 Flying Eagle Penny - $25,000. 4.) 1873 Indian Head Penny - $10,000. 5.) 1858 Flying Eagle Penny - $10,000. 6.) 1857 Flying Eagle Penny - $7,000. 7.) 1914 D Wheat Penny - $5,500. 8.) More items...

cointrackers.com - 25 Most Valuable Pennies (Updated 2022) - CoinTrackers.com

25 Most Valuable US Pennies

Here is a cool list that details the top 25 most valuable pennies ever minted in the United States of America (updated: 2022). These coin values / worth's are not based off common errors like double dies, but rather coins that were issued into circulation as is. Check out the list below, some of these old coins are worth a ton of money. This most valuable coin list is dynamic and is based upon the few thousand or so United States coins found in our ever growing database (updated: 2022). As of now our database consists almost entirely of coins from 1880s-2022, as we wanted to focus mostly on coins that were readily accessible and possibly still in circulation. The purpose of this page is to assist coin hunters and collectors in their pursuit of valuable coins. This page will save you a bunch of time, it represents hundreds possibly thousands of hours of research and detailed coin analysis.

List of 25 Most Valuable US Pennies

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