Common salt is an important chemical compound mainly made of sodium chloride (NaCl). It is one of the most commonly used substances in everyday life. Common salt appears as a white crystalline solid and is widely used in cooking to add taste and flavour to food. It is also used for preserving food items like pickles, meat, and fish because it prevents the growth of bacteria. Read Chemistry Formulas for more details.
Common salt is obtained from seawater through evaporation and from underground rock salt mines. Besides household use, it is also important in many industries. It is used in the production of chemicals such as caustic soda, washing soda, and baking soda. In cold countries, salt is spread on roads to melt ice during winter. In the human body, common salt helps maintain fluid balance and supports the proper functioning of muscles and nerves. Although it is essential for health, consuming too much salt may lead to health problems like high blood pressure and heart disease.
What is Common Salt?
Common salt, also known as table salt, is scientifically called sodium chloride (NaCl). It's a crucial part of our diet. Chemically, it's made when sodium hydroxide and hydrochloric acid react together.
Sources of Sodium Chloride
- Sea Water: The main source of sodium chloride. It's dissolved in seawater along with other salts like calcium and magnesium chlorides and sulphates.
- Rock Salt: Found in deposits around the world, rock salt is another source. Pure rock salt is white and crystalline, but it can be brown due to impurities.
Making Sodium Chloride
In a lab, sodium chloride can be made by combining sodium hydroxide with hydrochloric acid. The resulting solution can be evaporated to get solid sodium chloride. However, this method isn't used on a large scale because sodium chloride is naturally abundant.
Uses of Common Salt (Sodium Chloride)
Here are some important uses of common salt:
- Raw Material for Chemicals: Common salt is used to make many useful chemicals like:
- Sodium hydroxide (caustic soda)
- Sodium carbonate (washing soda)
- Sodium hydrogen carbonate (baking soda)
- Hydrochloric acid
- Hydrogen
- Chlorine
- Sodium metal
- Cooking: Common salt is used in cooking to improve the flavor of food. Our bodies need sodium chloride for:
- Nervous system function
- Muscle movement
- Producing hydrochloric acid in the stomach for digestion
- Leather Industry: It's used in tanning leather.
- De-icing Roads: Rock salt is spread on icy roads to melt the ice in cold weather.
- Agriculture: It is used as a fertilizer for sugar beet crops.
Common Salt as a Raw Material for Chemicals
Sodium chloride is important for making various chemicals. Here are a few examples:
- Hydrochloric Acid
- Washing Soda
- Baking Soda
When a strong salt solution (brine) undergoes electrolysis, it produces sodium hydroxide, chlorine, and hydrogen.
Making Chemicals from Common Salt
Now, let’s look at how some important chemicals are made from common salt:
- Sodium Hydroxide (Caustic Soda)
- Sodium Carbonate (Washing Soda)
- Sodium Hydrogen Carbonate (Baking Soda)
FAQs on What is Common Salt?
Common salt is a white crystalline substance mainly used in cooking and food preservation. It is scientifically known as sodium chloride. The chemical formula of common salt is NaCl because it is made of two elements: sodium (Na) and chlorine (Cl). Common salt is one of the most important compounds used in everyday life. It adds taste to food and also helps maintain proper balance of fluids in the human body. Salt is generally obtained from seawater or underground salt deposits. It dissolves easily in water and is widely used in homes, industries, and laboratories for different purposes related to food, health, and chemical production.
Common salt is mainly obtained from seawater and rock salt deposits found underground. In coastal areas, seawater is collected in shallow ponds and allowed to evaporate under sunlight. After the water evaporates, salt crystals remain behind. This process is called evaporation. Another method involves mining rock salt from underground mines. The mined salt is cleaned and purified before use. In industries, salt may also be refined to remove impurities and improve quality. Different types of salt such as table salt, sea salt, and iodized salt are prepared for various uses. The production of salt is very important because it is widely used in cooking, food preservation, and industries.
Common salt has many important uses in daily life and industries. The most common use is adding flavor to food. Salt is also used to preserve food items like pickles, chips, and canned foods because it helps prevent bacterial growth. In the chemical industry, common salt is used to prepare chemicals such as sodium hydroxide, chlorine, and baking soda. It is also used in soap making, textile industries, and water treatment plants. During winter in some countries, salt is spread on roads to melt ice. Doctors also use salt solutions in medical treatments. Because of its wide applications, common salt is considered an essential compound in modern life.
Iodised salt is common salt mixed with a small amount of iodine, an essential mineral needed by the human body. Iodine helps in the proper functioning of the thyroid gland, which controls growth and metabolism. Lack of iodine can lead to health problems such as goitre, weakness, and poor brain development in children. To prevent iodine deficiency, many countries encourage the use of iodised salt in homes. It is an easy and affordable way to provide iodine through daily meals. Doctors and health experts recommend using iodised salt regularly because it supports healthy physical and mental development while also helping maintain overall body functions properly.