<P> The iodine test is used to test for the presence of starch . Starch turns an intense `` blue - black '' colour upon addition of aqueous solutions of the triiodide anion , due to the formation of an intermolecular charge - transfer complex . In the absence of starch , the brown colour of the aqueous solution remains . This interaction between starch and triiodide is also the basis for iodometry . </P>
<P> The iodine test is used to test for the presence of starch . Starch turns an intense `` blue - black '' colour upon addition of aqueous solutions of the triiodide anion , due to the formation of an intermolecular charge - transfer complex . In the absence of starch , the brown colour of the aqueous solution remains . This interaction between starch and triiodide is also the basis for iodometry . </P>
why is iodine used to test for starch
why is iodine used to test for starch
Starch turns an intense `` blue - black '' colour upon addition of aqueous solutions of the triiodide anion
Starch turns an intense `` blue - black '' colour upon addition of aqueous solutions of the triiodide anion