What is the reaction between Iodine and starch?(Urgent!)?
I need the reaction equation(s) between Iodine and starch as one part of my experiment report.I will need source for your answer.Thanks!
- Anonymous1 decade agoFavorite Answer
Iodine solution is used to test for starch. A bluish-black color indicates the presence of iodine in the starch solution. It is thought that the iodine fits inside the coils of amylose. A 0.3% w/w solution is the standard concentration for a dilute starch indicator solution. It is made by adding 4 grams of soluble starch to 1 litre of heated water; the solution is cooled before use (starch-iodine complex becomes unstable at temperatures above 35 °C). This complex is often used in redox titrations: in presence of an oxidizing agent the solution turns blue, in the presence of reducing agent, the blue color disappears because triiodide (I3−) ions break up into three iodide ions, disassembling the complex.
Under the microscope, starch grains illuminated from behind with polarized light show a distinctive Maltese cross effect (also known as extinction cross and birefringence).Source(s): http://en.wikipedia.org/wiki/Starch
- NoraLv 44 years ago
Iodide and sulfuric acid react to form iodine.