The copper(II)sulphate is recovered and used to precipitate more copper(I)iodide.
Iodine and its compounds are. relative to the other halogens.costly substances.
Iodine is a dark-coloured solid which has a glittering crystalline appearance. It is easily sublimed to form a bluish vapour in vacuo but in air,the vapour is brownish-violet. Since it has a small vapour pressure at ordinary temperatures.iodine slowly sublimes if left in an open vessel;for the same reason,iodine is best weighed in a stoppered bottle containing some potassium iodide solution.in which the iodine is composed of molecules up to about 1000K ; above this temperature,dissociation into iodine atoms becomes appreciable.
Like bromine,iodine is solution in organic solvents,for example chloroform,which can be used to extract it from an aqueous solution. The iodine imparts a characteristic purple colour to the organic layer;this is used as a test for iodine (p.349).NB Brown solutions are formed when iodine dissolves in ether,alcohol,and acetone. In chloroform and benzene a purple solution is formed,whilst a violet solution is produced in carbon disulphide and some hydrocarbons. These colours arise due to change transfer(p.60)to and from the iodine and the solvent organic molecules.
The copper(II)sulphate is recovered and used to precipitate more copper(I)iodide. Iodine and its compounds are. relative to the other halogens.costly substances. Iodine is a dark-coloured solid which has a glittering crystalline appearance. It is easily sublimed to form a bluish vapour in vacuo but in air,the vapour is brownish-violet. Since it has a small vapour pressure at ordinary temperatures.iodine slowly sublimes if left in an open vessel;for the same reason,iodine is best weighed in a stoppered bottle containing some potassium iodide solution.in which the iodine is composed of molecules up to about 1000K ; above this temperature,dissociation into iodine atoms becomes appreciable. Like bromine,iodine is solution in organic solvents,for example chloroform,which can be used to extract it from an aqueous solution. The iodine imparts a characteristic purple colour to the organic layer;this is used as a test for iodine (p.349).NB Brown solutions are formed when iodine dissolves in ether,alcohol,and acetone. In chloroform and benzene a purple solution is formed,whilst a violet solution is produced in carbon disulphide and some hydrocarbons. These colours arise due to change transfer(p.60)to and from the iodine and the solvent organic molecules.
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