Iodine Test Lab Report

In this lab the evidence contained ingredients B, D, and E. My team members and I came up to this conclusion because Nathan felt the evidence sample and he specifically said that it felt powdery and grainy like a crystal. With that, my table members immediately knew that it had to be Toner because when my team originally did the evidence sample we noticed it smelled sweet. Powder B smelled sweet and Toner was the only one with B but Tavaglione and Siy also contained B as well. My team and I knew that it could not be Tavaglione and Siy because none of them contained powder D. Powder D was the only powder to react to the Iodine test and the evidence sample was one to react with the Iodine test as well. Now my team and I knew that it coulden’t be Tavaglione or Siy. Powder E

The iodine test resulted in chemical reactions when the powder turned purple or blackish. The vinegar test resulted in a chemical reaction when the substance fizzed up or gave a gas production. The water test resulted in a chemical reaction when the powder/substance changes its texture or color. It was important to make an evidence sample test to support my hypothesis because my table group and I have to clarify and make sure that it is the correct person that we are saying is guilty. It is good to retest because if the evidence sample does not match with our original combination then we will have to find a new combination that matches with the evidence sample. Some precautions that my table and I did to avoid cross contamination was to keep all of the lids (that held the powders) closed except for one. My table and I also made sure that the plate (that carried all of the powders) was rinsed clearly and was dried all the way. Next time to improve this lab I would make sure that my table would not argue with each other so we can get all of our work