Potassium iodide/iodine crystals

shannon_block · Post by **shannon_block** » Tue Feb 21, 2006 10:02 am

My 5th grade son has chosen the "bad apple" experiment for his science fair project. It states to test the starch amounts in fruit with a solution using potassium iodide and iodine crystals. The suggested web site to get these chemicals will not send it to a home as they are restricted. Any ideas of how we can get them or are there different chemicals that are not restricted that he could use instead?

hiramuzammal · Post by **hiramuzammal** » Tue Feb 21, 2006 8:32 pm

You can use iodine instead of Lugol's solution (potassium iodide).

This webpage has a procedure for using iodine to test for the presence of starch:
http://www.101science.com/Projects.htm