Question

Common salt have additives added into it so why they cantain it like iodine and anti calling agents what is their purpose
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Answer 1

Answer: Chemists use the elemental composition of compounds to determine their formulas (and vice-versa). We'll look at some of the hyperbole surrounding salt and salt additives to explore the meaning of formulas.

Here are a few of the claims by salt manufacturers that we can examine scientifically:

"sea salt" is better nutritionally than "regular salt"

salt additives are harmful

"kosher salt" tastes better than regular table salt.

"exotic salts" are more flavorful (see the figures).

freshly ground salt is superior

Additives

Iodine

Some "sea salts" have no additives, but most salt contains potassium iodide (KI) or cuprous iodide (CuI) as additives which provide the essential mineral nutrient iodine. This additive prevents thyroid disease. We'll see below that the additive with the least iodine per gram is often used, and explain why.

Reducing Sugars

If KI is added to the salt, an additional additive must be added to protect it from oxidation by air to give elemental iodine (I2), which has no nutritive value (and is actually toxic). One reducing sugar is explored below in an example.

Explanation: