1.3a Mini-lab MANIA

When comparing baking soda, corn starch, and baking powder one generally can’t make a clear distinction with the naked eye. However how would a scientist, or anybody for that matter, go about identifying each substance if it were given unlabeled? Through chemical and physical reactions! In our mini-lab, we had 3 samples of each of the stated white powders. To those powders we planned on adding a few drops of iodine, vinegar, and water. First we added Iodine to the 3 powders. Surprisingly, the baking powder turned a dark black and began to fizz. Next, we added the iodine to the cornstarch. Again, it turned black, but there was no fizzing. Then we added the iodine drops to the baking soda. Alarmingly, the solution was that of a yellow-orange color (same as the iodine liquid). Next we were to add vinegar to all the powders. The baking powder fizzed when the vinegar was added yet it did not dissolve. The corn starch had no fizzing or chemical reaction, but the solution was a milky color and it did not mix well. On the contrary, the baking soda and the vinegar got very fizzy when mixed. In fact we added a few more drops to the baking soda just to see how much it would react and it fizzed, or bubbled over the top of the container. It also was a milky white but composed that distinct chemical change. Lastly we added water to all of the powders. The baking powder got fizzy but it did not dissolve well. It was a milk white color. the Corn Starch was cloudy and also milk like but it separated when set down. The baking soda did not fizz, turned into an almost clear solution and you could see the individual granules at the bottom of the container. If someone was given one of these powders one could identify them by using iodine, water and vinegar and observing the physical and chemical reactions. Physical changes that would be observed may be changes of state, shape and the appearance but not the composition. Some chemical changes may be that a gas may have produced of any production of a precipitate. So yes someone could identify these powders by mixing them with these three liquids and observing their reactions to them.ImageImageImage

 

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