Salt is in the sea. 
Chloride is found in seawater. 

Chloride is a tiny part of many different things. 
Chloride is very important for living things. It is found in all body fluids. It helps your body keep a good balance. It also helps nerves send signals. Your stomach needs it to make acid. 
In nature, you find much chloride in seawater. You can also find it in the Great Salt Lake. Many chloride salts dissolve in water. Table salt is one example. We call this sodium chloride.
Some salts have special uses. Calcium chloride is a salt used to melt ice. It can also help keep roads strong. People use it to take dampness out of rooms.
Factories use a way called the chlor-alkali process. This way turns salt into other useful things. It uses a lot of power to work. This process makes chlorine and sodium hydroxide.
Chloride is a very important part of our world. It can be a single chloride ion or part of a larger molecule. 

Inside your body, chloride works like a tiny helper for your cells. It is an essential electrolyte found in all of your body fluids. Chloride helps maintain a balance of acids and bases in your system. It also helps your nerves send important signals through your body. Your stomach even needs chloride to produce hydrochloric acid for digestion.
Scientists have studied how chloride behaves for a long time. They know it can be changed through a process called oxidation. One way this happens is in the chlor-alkali process. This method turns salt solutions into chlorine gas and sodium hydroxide. 
Chloride is found in many places in the natural world. You can find a lot of it in seawater. The concentration in seawater is about 19,400 mg per liter. 
We use chloride in many ways in our daily lives. Calcium chloride is a salt used to melt ice on roads. It can also be used to remove dampness from a room. In the ocean, chloride is a big part of how salt water works. People even use chloride to check if river water is clean. This is because it can help show if there is sewage in the water. It is a small thing that makes a huge difference everywhere.
Chloride is a chemical term that describes many different types of molecules or compounds. It can refer to a chloride anion, which is a negatively charged chlorine atom. It can also describe a neutral chlorine atom that is covalently bonded to other atoms by a single bond. 
To understand chloride, we must look at its electronic properties. A chloride ion has a diameter of 181 pm, which is much larger than a standard chlorine atom at 99 pm. This size difference happens because the anion has one extra electron. This extra electron makes the atom's hold on its valence shell weaker. 
Chloride can exist in several different chemical states through a process called oxidation. Chlorine can assume several oxidation states, including -1, +1, +3, +5, and +7. At a -1 state, it is called chloride. At a +1 state, it is hypochlorite, which is the active ingredient in bleach. 

In the natural world, chloride is most commonly found in seawater. The concentration of chloride ions in seawater is approximately 19,400 mg per liter. You can also find it in higher concentrations in inland seas or subterranean brine wells. Examples include the Great Salt Lake in Utah and the Dead Sea in Israel. Because most chloride salts dissolve in water, chloride-containing minerals are usually found in dry climates or deep underground. Common minerals include halite, which is sodium chloride, and sylvite, which is potassium chloride.
Biology relies heavily on chloride to maintain homeostasis. It is the most abundant extracellular anion in the body. It accounts for about one third of the tonicity in extracellular fluid. In mammalian cells, chloride concentrations typically range from 5 to 100 mM. In blood plasma, the concentration is around 100 mM. 
The kidneys are the primary organs responsible for regulating serum chloride levels. Most chloride is filtered through a structure called the glomerulus. From there, the kidneys reabsorb most of it through the proximal and distal tubules. This happens through both active and passive transport. This regulation is crucial because high concentrations of chloride can have ecological effects. It can contribute to the acidification of streams or affect how aquatic plants and animals reproduce.
Human industry uses chloride in many massive and useful ways. The chlor-alkali industry is a major consumer of the world's energy. This process uses electrolysis to convert sodium chloride solutions into chlorine and sodium hydroxide.
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