How to correctly understand the role of potassium iodide

Potassium iodide is a chemical compound that provides stable (i.e., non-radioactive) iodine. The thyroid gland needs iodine to produce thyroid hormones. Having the right amount of stable iodine in the body can prevent the thyroid gland from absorbing radioactive iodine, which can reduce the risk of thyroid cancer after exposure to radioactive iodine.

Potassium iodide is not a "universal radiation antidote" and does not contribute to external exposure or protection against any radioactive material other than radioactive iodine (e.g., radioactive cesium), nor does it prevent radioactive iodine from entering the body, only inhaled or ingested internal radiation of radioactive iodine to the thyroid gland, while other protective measures (e.g., evacuation, concealment, food control, agricultural protection measures) protect against most radionuclides and external radiation. The ideal response is a combination of these countermeasures.

Potassium iodide is highly soluble in water, ethanol, acetone and glycerol, and the aqueous solution turns yellow when exposed to light, and precipitates free iodine.

Uses: Used to make organic compounds and chemical reagents. The so-called iodized edible salt that we often eat is to add potassium iodide or potassium iodate (according to the ratio of 1/20,000) to ordinary table salt (pure sodium chloride).

Potassium iodide has antifungal activity. It is clinically used for sporotrichosis, chromoblastomycosis, persistent erythema nodosum and nodular vasculitis, etc. Potassium iodide is a raw material for the preparation of iodide and dyes.

It is used as a co-solvent for photosensitive emulsifiers, food additives, iodine and some insoluble metal iodides.

1. Potassium iodide tablets, iodized edible salt.

2. It is widely used in the preparation of titration solution in volumetric analysis iodine method.

The effect of iodine-potassium iodide solution is ().

a.Indicates whether the extract is fully hydrolyzed, with complete hydrolysis shown in blue.

b.Indicates that the extract contains amylopectin, which contains starch and is shown in blue.

c.Indicates whether the extract is fully hydrolyzed, and complete hydrolysis does not show blue pulses.

d.The fingercode omits to indicate whether the pH value is acidic or not.

Correct Answer: Indicates whether the extract is completely hydrolyzed or not, fully hydrolyzed does not show blue.

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Potassium iodide

Potassium iodide (potassiumiodide) physical formula ki, molecular weight. Colorless or white cubic crystals. The taste is salty and bitter.

In the humid air, there is a slight damp skin vertical dissolution, exposed to the air is easy to be oxidized, precipitation of iodine and gradually yellowing, light and burning finch moisture can accelerate its decomposition. Specific gravity. The melting point is 681, and the boiling point is 1,330.

Soluble in water, ethanol, acetone and glycerol. The aqueous solution can dissolve the iodine and form triiodoplasma ions ( i 3 - The aqueous solution is also easy to oxidize and turn yellow, which is easier when acidic, and can be prevented by adding alkali. It is obtained by the interaction of hydroiodic acid and potassium bicarbonate.

It is used as an analytical reagent and a raw material for iodide and dyes, and is also used as a photosensitive emulsifier and food additives. It is used in medicine to prevent and treat goiter (big neck disease), and is also used for pre-operative preparation for hyperthyroidism, and can also be used as expectorant and diuretic.