In chemistry the ending on a chemical compound's name indicates whether is is in its elemental state or if it is bonded to something else. It can also indicate the ratios of ingredients in the chemical.
In the case of iodine , the INE ending indicates elemental iodine - in its pure one type of atom form. Pure iodine is toxic as are the rest of the family of elements to which it belongs ( Fluorine, Chlorine, Bromine, Iodine, and Astatine). Fluorine is the most chemically reactive and toxic of the family.
In the case of the IDE ending, the iodine is chemically bonded to another element. When elements bond, the compounds that form have different properties than the elements from which they are made.
Sodium ChlorIDE = Table salt 1 atom sodium + 1 atom of chlorine
Sodium is a metal that will violently explode in water
Chlorine is a yellow green gas that will rip your lungs apart
Put them together and sprinkle it on french fries.
Sodium FluoriIDE = active ingredient in toothpaste
Potassium IodIDE is what is in the reef additives and is also a salt.
1 atom of Potassium bonded to 1 atom of chlorine. When it is dissolved in water, solution is formed.
The term SALT is a word for any compound formed from a group of metals called the Alkali metals and the Family called the Halogens ( to which iodine belongs). Not all of these salts are safe to eat though so don't go sprinking your aquarium chemicals on your scrambled eggs ('8O') !
There is a reason why these particular atoms like each other so much, but unless anyone is truly interested ....... ( I'm a science teacher so I tend to get a little excited about these things('
At a retail store you will pay from $7.00 to $12.00 for an 8 ounce bottle of a concentrated KI
( Potassium Iodide ) solution. All that this means is that the water is holding as much of the KI
as it can. You will have paid at leat $8.00 for about a nickels worth of material. In fact the packing for the product was probably more costly than the chemicals. I paid $4.00 for 500 grams of KI
crsytals. Enough to keep me in solutions for just about forever.
Other common salts that you pay big bucks for in the lfs
Again - nothing exotic but definitely overpriced.