As we know PPM=mg/Kg, if d=1 so PPM=mg/L
At first we must calculate the densty of ethanol in kg, so when we use 0.5L of ethanol it means :
0.789 kg/L = x kg/0.5L : x=0.394 Kg
For a 100 ppm solution of iodine in 0.5 L of ethanol we have 100=mg I2 /0.394 kg
so mg I2 = 39 mg
S.Pourmand
M.Sc. Organic chemistry
A mixture of iodine and ethanol is considered heterogeneous because iodine does not dissolve in ethanol and will remain visibly separate as a solid in the liquid ethanol.
filtration
Tincture of iodine contains iodine and alcohol
When ethanol reacts with iodine, it forms a yellow-brown solution due to the formation of iodoethane and hydrogen iodide. The reaction is a substitution reaction where iodine replaces a hydrogen atom in ethanol.
Yes, it is elemental iodine dissolved in ethanol.
Iodine is much more soluble in ethanol than in water, so it will usually form a homogeneous mixture. Of course, if you add more solid iodine than will dissolve in your quantity of ethanol at the temperature at which you are working, the excess solid will sink to the bottom. In that case, you have a heterogeneous mixture.
A tincture is a solution; in this case the solvent is ethanol or water.
The iodine test is commonly used to detect the presence of starch in a sample. If the leaf turns blue-black when treated with iodine solution after boiling with ethanol, it indicates the presence of starch in the leaf tissue.
The iodine stain solution you're referring to might be Lugol's iodine. This is iodine and potassium iodide in water. The product available in a pharmacy is tincture of iodine which is iodine and potassium iodide in ethanol and water. Please see the links.
To make iodine solution at home, mix 1 gram of iodine crystals with 10 milliliters of alcohol (such as ethanol or rubbing alcohol). Stir the mixture until the iodine crystals dissolve completely. This solution can be used as an antiseptic or for other purposes.
To prepare a 1% iodine solution, you can mix 1 gram of iodine crystals in 100 ml of distilled water or ethanol. Stir the mixture until the crystals are fully dissolved. This solution can be used for various purposes, such as laboratory experiments or disinfection.
Tincture of iodine is a solution containing iodine, water, ethanol, and sodium iodide. It is used as an antiseptic to disinfect minor cuts, wounds, and skin infections. Tincture of iodine can also be used to help treat fungal infections.