Potassium iodide is a metal iodide salt with a K(+) counterion. A compound that contains pentavalent iodine, which is usually ionically bound to electropositive atoms. It is a scavenger of hydroxyl radicals.It has a role as a radical scavenger and an expectorant. It contains an iodide.
Potassium iodide CAS 7681-11-0 Product Information
|Product Name:||Potassium iodide|
|Synonyms:||iodic acid potassium salt;potassium,iodide;Potassium salt of hydriodic acid;EINECS 231-442-4;POTASSIUM MONOIODIDE;Potassium iodide (JP15/USP);Potassium iodide;Potassium iodide [JAN];MFCD00011355;Patassium Iodide|
|Boiling Point:||184 °C(lit.)|
|Melting point:||681 °C (lit.)|
|Appearance:||White to off-white crystalline powder|
|Solubility:||H2O: 1 M at 20 °C, clear, colorless|
potassium iodide formula/formula for potassium iodide/potassium iodide chemical formula
Potassium iodide is made by absorption of iodine in potassium hydroxide:
I2 + 6KOH → 5KI + KIO3 + 3H2O.
Most potassium iodate, KIO3 , is separated from the product mixture by crystallization and filtration. Remaining iodates are removed by evaporation of the solution and other processes, such as carbon reduction or thermal decompostion at 600oC to iodide:
2KIO3 → 2KI + 3O2.
Another method of preparation that does not involve the formation of iodate is by treating iron turnings with iodine solution. The product, ferrosoferric iodide, Fe3I8?16H2O, is boiled with 15 wt% potassium carbonate solution:
Fe3I8.16H2O + 4K2CO3 → 8 KI + 4CO2 + Fe3O4 + 16H2O.
A similar method is used to prepare potassium bromide, discussed earlier (see Potassium Bromide.)
Potassium iodide can be prepared by reacting hydriodic acid with potassium bicarbonate:
HI + KHCO3 → KI + CO2 + H2O.
It is purified by melting in dry hydrogen.
Potassium iodide also may be obtained by various electrolytic processes.
What is potassium iodide?
Potassium iodide is a metal iodide salt with a K(+) counterion. A compound that contains pentavalent iodine, which is usually ionically bound to electropositive atoms. It is a scavenger of hydroxyl radicals.
It has a role as a radical scavenger and an expectorant. It contains an iodide. It is a type of iodine that is not radioactive and can be used to help block one type of radioactive material, radioactive iodine (I-131), from being absorbed by the thyroid.
potassium iodide benefits
Potassium iodide is used to treat overactive thyroid and to protect the thyroid gland from the effects of radiation from inhaled or swallowed radioactive iodine.
potassium iodide hazards
May irritate eyes or open cuts.
lead nitrate and potassium iodide/lead nitrate and potassium iodide reaction
potassium iodide + lead nitrate/lead nitrate + potassium iodide.The lead nitrate [Pb(NO3)2] reacts with potassium iodide (Kl) causing exchange of ions between the reactants leading to the formation of potassium nitrate (KNO3) and a yellow precipitate of lead iodide (PbI2).
The reaction involved is given below: Pb(NO3)2(aq)+2KI (aq)→PbI2(s)(↓)+2KNO3(aq)
hydrogen peroxide and potassium iodide
When the KI hits the hydrogen peroxide, it changes color to brown as the active catalytic form of the iodide is formed.
potassium iodide melting point
681 °C (lit.)
potassium iodide molar mass
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