chemistry lab paper sherlock holmes experiment

Our objective for the Sherlock Holmes Experiment was to illustrate that some chemicals can be identified or differentiated by simple chemical tests, such as solubility, pH, or color tests. In our group we had to test come common powders such as Alka-Seltzer, baking soda, flour, Vitamin C (ascorbic acid), and salt. Other chemicals that were used to do this experiment were vinegar, and Iodine 2 Solution. The equipment used to do this experiment was red litmus paper, and 5 test tubes per group. After all materials were gathered, we then had to do five different tests to determine what the powder material does. The first test was to see what the powder materials do in water. We had to add a scoop of each of the common powders to an equal amount of water, each in a separate test tube. Then we had to stir/shake it up and record our observations. We had determined that the flour did not dissolve in water. The vitamin C did dissolve in the water. The salt, Alka-Seltzer, and baking soda also did not dissolve in the water. In the second test we did, we had to determine what each solution does with litmus paper. We had dipped a piece of red litmus paper in each test tube and then observe what happens. When we put the litmus paper in the flour, Vitamin C, and salt, the litmus paper stayed the same color (red) and there was no reaction to either of them. However, when we put the litmus paper in the Alka-Seltzer, and baking soda, the litmus papers turned to a blue color. In the third test, we had to add a squirt (half mL) of vinegar in each test tube to observe what happens. When we put vinegar in the flour, we observed that a milky like solution was made. When we put vinegar in the Vitamin C and the salt there was no reaction to either of the common powders. The Alka-Seltzer, and the baking soda, when mixed with vinegar, had a bubbly/foaming reaction.
In the fourth test, we had to add a squirt (half mL) of Iodine 2 solution in each of the test tubes to