Yes, salt is considered a pure substance. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Salt, or sodium chloride (NaCl), is a chemical compound made up of two elements: sodium and chlorine. These elements are combined in a fixed ratio, which means that every molecule of salt has the same composition.
In its pure form, salt is a crystalline solid that is white in color and has a distinct taste. It is commonly used in cooking and food preservation. Because salt has a uniform and definite composition, it is classified as a pure substance. This is true whether it is in its solid form or dissolved in water, as long as no other substances are mixed with it.
It’s important to note that while salt is a pure substance, the salt we use in everyday life, such as table salt, often contains additives like iodine or anti-caking agents. These additives make the salt a mixture rather than a pure substance. However, in its pure form, without any additives, salt is indeed a pure substance.