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CHI3 See also: Dumas showed than it contained hydrogen
.
It is formed by the See also: action of iodine and aqueous potash on See also: ethyl See also: alcohol, See also: acetone, acetaldehyde and from most compounds containing the grouping CH3•CO•C–
.
Its formation from alcohol may be represented thus: C2H5OH+ 412+6KHO= CHI3+KHCO2+5KI+5H20
.
It crystallizes in yellow hexagonal plates, melting at 119-1200 C., and is readily soluble in alcohol and See also: ether, but is insoluble in See also: water
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It has a characteristic odour and is volatile in steam
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On reduction with hydriodic acid, it yields methylene iodide, CH2I2
.
More recently, See also: iodoform has been prepared by the electrolysis of a solution of potassium iodide in the presence of alcohol or acetone, the electrolytic cell being fitted with a diaphragm, in See also: order to prevent the hydrogen which is formed at the same See also: time from reducing the iodoform, or from combining with the iodine to See also: form hydriodic acid
.
K
.
See also: Ellis uses a solution of potassium iodide and sodium carbonate in water, which with the necessary alcohol is contained in a porous cell fitted with a See also: lead anode, whilst the See also: cathode compartment contains a solution of See also: caustic soda and a nickel electrode
.
The electrolysis is carried out at a temperature of 7o° C., and a current See also: density of one ampere per square decimetre is used
.
At the end of three See also: hours a yield of 7o 04, of the theoretical quantity is obtained
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[back] IODINE (symbol I, atomic weight '26.92) |
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