Ammonium chloride

This is a white salt.

It looks like tiny crystals. It can melt in water very fast.

It is used to help plants grow. It gives them food to stay strong. It helps rice and wheat grow in Asia.

Some people use it in food. It makes some candy taste salty. It can also make cookies very crisp.

It can even help a giant squid. The squid uses it to float in the sea. This helps them stay in the water.

It is a very busy salt. It does many jobs for us.

Ammonium chloride is a white salt made of tiny crystals.

It can dissolve very easily in water. This salt can be found in nature. It often forms near volcanic vents. It can also form on coal dumps. In its natural form, it is called salammoniac.

Many people use this salt to help plants grow. It is a source of nitrogen. Nitrogen is a nutrient that plants need. About 90% of it is used as fertilizer. It helps crops like rice and wheat grow in Asia.

This salt has many other jobs. It is used in some foods. It can make cookies very crisp. It also gives a salty taste to liquorice. In the ocean, a giant squid uses it to float. The salt is less dense than seawater. This helps the squid stay in the water.

Scientists also use it in labs. They use it to make cooling baths. It can even help make old photos. It was used to coat paper with egg whites. This helped make very clear pictures.

Ammonium chloride is a white crystalline salt.

It is an inorganic compound made of ammonium and chloride. This substance is highly soluble, which means it dissolves very easily in water. When you mix it with water, the solution is mildly acidic. In nature, this salt is known as salammoniac. It often forms on burning coal dumps from gases. It can also be found near volcanic vents. These crystals form directly from gases near the vents. They do not last long because they dissolve so quickly in water.

There are many ways this salt is made and used. One way to make it is by reacting ammonia with hydrochloric acid. This can happen by adding these two liquids to gas-washing bottles. Air can act as a carrier to make the gases collide and react. Another way is through the Solvay process. This process is used to make sodium carbonate. It also helps to stop ammonia from escaping during industrial work. In the lab, scientists sometimes use it to make cooling baths. It can even be used to make a special white layer on fossils. This layer helps photographers see the details of a fossil better.

People have known about this salt for a very long time. The Romans found it near the Temple of Ammon in Siwa. Because of this, they called it sal ammoniacus. This name honors the Siwan Berber god, Ammon. The word comes from the ancient Greek word ammoniakos. This Greek word means something relating to Ammon. An ancient writer named Pliny also wrote about a similar salt. He found it in the Roman province of Cyrenaica. He called it hammoniacum because it was near the Temple of Jupiter Amun.

This salt is very important for farming around the world. About 90% of all ammonium chloride is used as fertilizer. It provides nitrogen, which is a nutrient for plants. It is about 26% nitrogen by weight. Farmers use it for crops like rice and wheat in Asia. They must be careful with how much they use. Too much can make the soil too acidic. Some plants, like grapes or beans, can even be harmed by it.

Using the right amount helps plants grow well without getting hurt.

You might find this salt in unexpected places every day. It is used as a flavor in salty liquorice. It also helps make cookies have a very crisp texture. In the ocean, giant squid use it to float. They have the salt throughout their bodies to stay balanced in the water. This works because the salt solution is less dense than seawater. It is also used in some medicines to help people cough. Even in old history, it helped make photos. In the 1800s, it was used with egg whites to make clear pictures on paper.

Ammonium chloride is an inorganic chemical compound with the formula NH4Cl. It is also known as an ammonium salt of hydrogen chloride. This substance appears as a white crystalline salt that dissolves very easily in water. When this salt is mixed with water, the resulting solution is mildly acidic. In its natural mineral form, it is called salammoniac.

This compound is important in many different fields, from large-scale farming to specialized scientific photography.

Chemically, ammonium chloride is created through specific reactions. One common method involves combining ammonia (NH3) with either hydrogen chloride gas or a hydrochloric acid solution. In a laboratory setting, this can be demonstrated by adding these two liquids to gas-washing bottles. As air is injected into the tubes, the ammonia and hydrogen chloride gases collide and react to form a solid product. Another major production method is the Solvay process. This industrial process is used to manufacture sodium carbonate (Na2CO3). It also serves a secondary purpose by minimizing the release of ammonia during industrial operations.

Ammonium chloride also shows interesting behaviors when heat is applied. When heated, the substance appears to sublime, which means it turns directly from a solid into a gas. However, it actually undergoes a reversible decomposition. This means the NH4Cl breaks down into ammonia and hydrogen chloride gases, which can then reform into the solid salt upon cooling.

The compound can also react with strong bases like sodium hydroxide to release ammonia gas. It similarly reacts with alkali-metal carbonates at high temperatures to produce ammonia, alkali-metal chloride, and carbon dioxide.

Historically, humans have been interacting with this salt for thousands of years. The Romans extracted the substance from deposits near the Temple of Ammon in Siwa. Because of this location, they named it *sal ammoniacus*, or Ammonian Salt, to honor the Siwan Berber god, Ammon. The name is derived from the ancient Greek word *ammoniakos*. The ancient writer Pliny also recorded a similar salt called *hammoniacum* in the Roman province of Cyrenaica. This name was used because the salt was found near the Temple of Jupiter Amun.

Agriculture is the most significant use for this chemical today. Approximately 90% of the world's production of ammonium chloride is used as a nitrogen source in fertilizers. The compound is roughly 26% nitrogen by weight. It is frequently used to fertilize crops like rice and wheat, particularly in Asia. Farmers must apply it at specific concentrations, usually between 50 and 100 milligrams of nitrogen per liter of water. This is equivalent to about 0.2 to 0.4 grams of ammonium chloride per liter. If used incorrectly, it can acidify the soil or cause chloride toxicity in sensitive plants like beans, grapes, or avocados.

Beyond the farm, ammonium chloride serves many specialized roles. In the ocean, giant squid use a solution of ammonium chloride throughout their bodies to maintain neutral buoyancy. This works because the solution is less dense than the surrounding seawater. In medicine, it acts as an expectorant in cough medicines by irritating the bronchial mucosa to produce fluid that is easier to cough up. It is also used as a systemic acidifying agent to treat certain medical conditions like metabolic alkalosis. In the food industry, it is known as sal ammoniac or E510. It is used to make cookies crisp and provides the distinct flavor for salty liquorice in many regions.

Finally, the compound has unique properties for science and art. In the 19th century, it was essential for albumen silver prints. Photographers mixed egg whites with ammonium chloride to coat paper, creating a smooth surface for light-sensitive silver chloride. This process helped produce fine details and warm tones in early photographs. In paleontology, scientists deposit ammonium chloride vapor onto fossils. This creates a brilliant white, inert layer of tiny crystals. This layer enhances the contrast of the fossil, making it easier to photograph three-dimensional specimens in high detail.