MadSci Network: Chemistry

Re: Can you explain the reaction between As and I2 in HCl to form AsI3?

Date: Thu Oct 5 10:43:11 2000
Posted By: Jerry McCormick, Staff, Chemistry, Independent Consultant
Area of science: Chemistry
ID: 969323583.Ch

The reaction in question is a simple oxidation-reduction: molecular arsenic 
(As,) being oxidized to As(+) and iodine being reduced to I(-).  The AsI 
resulting then reacts in solution with additional Iodine to form the complex 
ion, I3(-) which then is associated with the As(+) to form the compound AsI3.

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