Test for the presence of starch

• what solution is used to test for starch?

  iodine solution
• how would you test for the presence of starch?

  1. add a few drops of the iodine solution to the starch sample
  2. there will be a colour change from orange-brown (from the iodine solution) to blue-black if starch is present
  3. the depth of blue-black colour gives an indication of relative concentration of starch
  4. an accurate concentration cant be determined so, like the benedict’s test, this test is qualitative