Chloride reaction is a salt formed from the reaction of hydrochloric acid with a metal, inorganic base or a metal oxide or the combination of chlorine with a metal forms it. A chloride is considered as a chemical compound of chlorine. In medical terms, chloride is a negatively charged substance present in the extracellular fluid and blood. An increase or decrease of chloride in the body may face problems like hypercholremia and hypocholremia respectively. The normal range of chloride in the body is 98-108 mmol/L.

Some of the chloride reaction salts are calcium chloride, potassium chloride, ammonium chloride, sodium chloride, etc. Sodium chloride is in general called as common salt. Most of the chloride salts are easily soluble in water. Silver chloride and mercurous chloride are also type of chloride salts that are insoluble, but lead chloride is soluble in water to very small extent. Most of the metal chlorides are melted without decomposition except for two: chlorides of platinum and gold. Metal chlorides produce electricity when they are suspended in water and they can be disintegrated by electrolysis to the metal and chlorine gas.

Thionyl chloride is also a product of chloride reactions. It is produced by the reaction of sulphur trioxide and sulphur chlorides. It is also a product got by the reaction of sulphur dioxide with phosphorous chlorides. Thionyl chloride is a very important product used in the manufacture of many chemicals and chemical outcomes like acid chlorides, agrichemicals, pharmaceuticals and dyestuffs. They are mainly used in industries and laboratories. This chloride reaction takes place even in the manufacture of batteries, which store energy and exhibit in the electrical form.

Everyone is aware of the sodium chloride reaction. When a silver colored metal, sodium, reacts with a poisonous and yellow-green gas, chlorine, it produces sodium chloride. It is an ionic compound commonly known as common salt or table salt. Sodium chloride is also prepared naturally by evaporating the seawater as salt. Most commonly, salt is used in cooking, production of paper and pulp, in fabric factories for setting dye, production of detergents, etc. sodium chloride is used for the production of chlorine, which is in turn used for the production of pesticides and PVC.

In the study of potassium chloride reactions, it is important to note that it can react as a source of chloride ion. Potassium is electropositive than the sodium. Hence, with the reaction of metallic sodium, potassium chloride can be reduced to a metal by removing the potassium by distillation. Plants mainly depend upon the potassium as their main source of food. Hence, potassium chloride is largely used as fertilizers. It is used in food processing, medicines and for some scientific applications. It is used as a sodium free substitute in common salt.

Potassium chloride reaction was once used as fire extinguisher. Since potassium bicarbonate was later introduced in 60s, potassium chloride was dropped in extinguishers. Potassium chloride has an optical crystal feature with a transmission range from 210 nm to 20 µm. In previous times, it was used in the infrared spectrum range, but again more tougher crystals like ZnSe have replaced potassium chloride for IR spectral range applications.