The iodine molecule can act as a Lewis acid in that it combines with various Lewis bases. In such reactions the alkali iodides may be regarded as bases. ![]() Alkali iodides react with compounds containing iodine with the oxidation number +1, such as iodine bromide, as in the following equation: The alkali iodides are soluble in molten iodine and give conducting solutions typical of weak electrolytes. The electrical conductivity of molten iodine has in part been ascribed to the following self-ionization equilibrium: Molten iodine may be used as a nonaqueous solvent for iodides. (Highly concentrated iodine is poisonous and may cause serious damage to skin and tissues.) For this reason, iodine is best weighed in a stoppered bottle for the preparation of an aqueous solution, the bottle may contain a solution of potassium iodide, which considerably decreases the vapour pressure of iodine a brown complex (triiodide) is readily formed: Iodine has a moderate vapour pressure at room temperature and in an open vessel slowly sublimes to a deep violet vapour that is irritating to the eyes, nose, and throat. Above 700 ☌ (1,300 ☏), dissociation into iodine atoms becomes appreciable. The molecular lattice contains discrete diatomic molecules, which are also present in the molten and the gaseous states. Iodine is a nonmetallic, nearly black solid at room temperature and has a glittering crystalline appearance. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find. ![]() Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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