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Iodide is a chemical compound that is commonly used for various purposes such as in medicine, photography, and analytical chemistry, among others. It is made up of iodine and another element, typically a metal such as potassium or sodium, in a molecular compound.

The molecular formula for iodide depends on the type of metal that it is combined with. For example, potassium iodide, which has the molecular formula KI, is the most common form of iodide. Sodium iodide, on the other hand, has the molecular formula NaI.

So, why is iodide so important? Well, iodide has several important uses. In medicine, it is commonly used as a thyroid blocking agent to protect the thyroid gland from radioactive iodine in case of exposure to nuclear radiation. Iodide is also used to treat various thyroid diseases such as hyperthyroidism and to prevent goiter, a condition where the thyroid gland becomes enlarged.

In the field of photography, iodide is used as a sensitizer for some photographic emulsions. It is also used as a reducing agent in the silver iodide process of photography.

In analytical chemistry, iodide is a useful reagent for detecting the presence of certain metals in solution. This is because when iodide is added to a solution containing certain metals, it can form a complex that is easily detectable.

In summary, iodide is a very useful chemical compound with a variety of important applications in different fields.