How to Distinguish Gold and Copper with 100% Accuracy
Key Takeaways
- Gold and copper often easily make us confuse them with each other because their colors are quite similar. However, distinguishing these two metals is not too difficult. Join Jemmia to learn about...
Gold and copper often easily make us confuse them with each other because their colors are quite similar. However, distinguishing these two metals is not too difficult. Join Jemmia to learn about the ways to distinguish gold and copper in the article below!
Concepts of gold and copper
What is gold?
Gold is known as a precious metal, with a dark yellow color and reddish shine, soft, not easily corroded, compared with other metals such as: aluminum, silver, zinc, copper, etc.
Gold has been used since ancient times for many different purposes such as: currency, jewelry, etc. Gold mining and production activities take place all over the world. Among them, the leading gold-producing countries are South Africa, Australia, Russia, and China. Today, gold is considered the asset that preserves value over the long term and is the safest during periods of inflation.
See more: Top 10 largest gold mines in the world by reserves and output
What is gold?
What is copper?
Copper is a metal and is not classified as a precious metal, with a characteristic orange-red color and high electrical and thermal conductivity. The symbol for copper is Cu in the periodic table of chemical elements. Copper is commonly used as an electrical and thermal conductor and is applied in the construction materials industry.
What is copper?
Copper compounds usually exist in the form of copper(II) salts and are blue or green in color.
Similarities and differences between gold and copper
Although gold and copper are both valuable metals, they have distinct characteristics. Below is a detailed comparison table to help you visualize more clearly:
| Gold | Copper | |
| Differences |
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| Similarities |
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Gold and copper are both valuable metals, but they have different physical and chemical properties. That leads to different applications in life. Understanding the similarities and differences between these two metals will help you have a more general view of them.
The most accurate ways to identify gold and copper
Save the ways to identify gold and copper below for use when needed!
How to distinguish copper and gold using acid
The acid used to distinguish copper and gold is nitric acid. When copper is placed in acid, it turns dark brown. Meanwhile, when gold is placed in a nitric acid solution, it does not cause any reaction; the color and shape remain intact.
How to distinguish copper and gold using acid
How to identify gold and copper by color
By visually observing them, we can also distinguish copper from gold.
How to identify gold and copper by color
Gold has a brilliant yellow, shiny color, while copper has a reddish-brown color and additional streaks or spots of different colors.
Distinguishing gold and copper based on physical properties
Based on the physical properties of gold and copper, you can also determine which is copper and which is gold.
- Gold is an inert metal, so it is not affected by air, humidity, acid, or temperature. Gold only reacts with mercury.
- Copper has thermal and electrical conductivity, so it is often used as the main material for electrical wires. Copper is also used to make batteries for other electrical devices and is often easily oxidized by air.
Distinguishing gold and copper based on physical properties
Identifying gold and copper with vinegar
Using vinegar is one of the simple and effective methods to identify copper and gold. Simply pour vinegar onto the metal sample and carefully observe their reaction.
When vinegar comes into contact with gold, there will be no reaction. This non-reactive property of gold helps us quickly distinguish it from other metals.
On the contrary, if vinegar comes into contact with copper, you will see bubbling or fizzing occur. This is because the acetic acid in vinegar reacts with copper and creates hydrogen gas.
Identifying gold and copper with vinegar
With this method, you can easily identify copper and gold simply and minimize risks when conducting transactions related to metal products. However, remember that this method is only relative and should be combined with many testing methods to ensure accuracy.
With the ways to distinguish gold and copper that Jemmia has shared above, hopefully it will be helpful to you. Accurately determining copper and gold plays a very important role in buying, selling, commerce, and business activities. That helps ensure absolute accuracy and avoid potential risks during transactions.
