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Last updated date: 09th Dec 2023
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MVSAT Dec 2023

Identify the acid and the base from which sodium chloride is obtained. Which type of salt is it? When is it called rock salt? How is rock salt formed?

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Hint: We must understand the chemical composition of sodium chloride and how is it produced and when is it considered as rock salt. Sodium chloride, or salt, is an ionic compound with the chemical formula $NaCl$, which represents a $1:1$ combination of sodium and chloride ions. The mineral (natural) origin of sodium chloride, rock salt is a type of salt. It's also known as halite, and it's found with other evaporite deposit minerals including sulphates, halides, and borates.

Complete answer:
We have to know that the salt is formed when an acid and a base reacts. It is obtained by the reaction between Hydrochloric acid and Sodium Hydroxide to give Sodium Chloride and Water. Hydrochloric acid is the acid and Sodium Hydroxide is the base. It is also known as Common salt and is a type of neutral salt since it carries no charge. Rock salt, also known as halite, is a type of salt that is the mineral (natural) component of sodium chloride $\left( {NaCl} \right)$. Halite crystallises in isometric shapes. It is sodium chloride in its impure, crystallised, and mineral nature. Halite is most often found in sedimentary rocks, where it was produced by evaporation of seawater or saline lake water. The drying up of enclosed lakes and restricted seas will result in vast beds of sedimentary evaporite minerals, including halite.

We must be noted that hydrochloric acids and sodium hydroxide are the acids and bases that react to form sodium chloride. Seawater or salt lakes are used in the industrial manufacturing of sodium chloride. The water is evaporated, leaving only salt crystals that have been purified of impurities. Sodium chloride is also obtained from salt mines. Sea salt is sodium chloride. Since it is made from halite, a mineral type of sodium chloride, it is also known as rock salt. Halite is present in the formation of minerals forming rocks of masses.