how does ikdine interact with startch to form a dark blue- black colored solution?
Homework Answers
Iodine, in solution phase, exists as Triiodide as below-
Tri-iodide can be obtained, if we add iodine into a potassium iodide solution where iodide ions are available.
Starch, being a polysaccharide, can exist as a helical shape. So when we add Iodine into a starch solution, in order to get fitted into the Starch helix, Iodine reacts in its triiodide form which is the right shape for iodine to get fitted into a polysaccharide helix. finally, a Starch-triiodide complex is formed which is blue-black in color.
Hence, the overall reaction
is-
.
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