Flask Iodine is generally, used for determination. Iodine flasks come with ground joint and stopper, These Glass flasks are made from borosilicate glasses. Borosilicate glass is very much known for its property of having very low coefficients of thermal expansion, which makes it resistant from thermal shocks more; so than any other common glasses do. Iodine flask, a bottle, usually made up of glass, it has a round body and as well as narrow neck, particularly, used especially in biology or chemistry laboratory experimentation a flat metal or glass bottle for carrying in the pocket: a flask of brandy.The ground glass joint of the iodine flask prevents these vapours from escaping, improving the accuracy of your analysis.
As for the funnel, its simply there to help get your stuff into the flask in the first place, preventing loss through spillage and preventing the need for a separate glass funnel. Anything that ends up on the tapered neck is simply rinsed directly into the flask. Iodine itself, and iodine related molecules produced during the analysis are, to a certain extent, volatile.
