What is the ingredients of gold
Gold (chemical symbol Au) is a popular precious metal that is widely used in jewelry, investment and industrial fields due to its rarity, aesthetics and stability. So, what exactly is the component of gold? This article will analyze it in detail for you from the aspects of chemical composition, common alloys, purity standards, etc.
1. The chemical composition of gold
The chemical composition of pure gold is a single element Au, with an atomic number of 79. In nature, gold usually exists in elemental form, but also forms alloys or compounds with other elements. Here are the chemical properties of gold:
| property | Value |
|---|---|
| Atomic number | 79 |
| Atomic weight | 196.96657 |
| density | 19.32 g/cm³ |
| Melting point | 1064°C |
| Boiling point | 2807°C |
2. Common alloys of gold
Pure gold is softer and to enhance its hardness and durability, it usually forms alloys with other metals. The following are common gold alloys and their compositions:
| Alloy name | The content of gold | Other metals |
|---|---|---|
| 18K gold | 75% | Copper, silver |
| 14K gold | 58.3% | Copper, silver, zinc |
| White 18K gold | 75% | Palladium, nickel |
| Rose Gold | 75% | copper |
3. Gold purity standard
The purity of gold is usually expressed in "K" (carat) or "million percentage". The following are common gold purity standards:
| Purity mark | The content of gold | use |
|---|---|---|
| 24K | 99.9% | Invest in gold bars and high-purity jewelry |
| 22K | 91.6% | Traditional jewelry, gold coins |
| 18K | 75% | Modern jewelry, high-end jewelry |
| 14K | 58.3% | Wearing jewelry every day |
4. Application fields of gold
Due to its unique nature, gold is widely used in many fields:
1.Jewelry: Gold is the first choice material for making jewelry such as rings, necklaces, bracelets, etc., especially 18K and 14K gold are more popular for their hardness and aesthetics.
2.invest: Gold bars and gold coins are common investment tools, and 24K pure gold is highly favored for its value-preserving function.
3.industry: Gold has excellent conductivity and corrosion resistance, and is used in high-precision fields such as electronic equipment and aerospace equipment.
4.Medical:Gold is also used in dentistry and in certain medicines, such as gold alloys for crown filling.
5. How to identify the purity of gold
The purity of gold can be identified by the following methods:
1.Marking method: Regular gold products are usually marked with purity, such as "24K" and "18K".
2.Acid test method: Use nitric acid solution to test the reaction of gold. Gold of different purity reacts differently to acid.
3.Density test method: By comparing the density of gold with standard values, judge its purity.
4.X-ray fluorescence method: Professional instruments can detect the composition and purity of gold non-destructive.
Conclusion
The composition of gold not only includes pure gold (Au), but also involves a variety of alloy forms. Understanding the purity of gold, the alloy composition and its application will help you make smarter choices when buying or investing. Whether worn as jewelry or as asset preservation, gold is always an irreplaceable precious metal.
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