I felt pretty confident with the pre-lab quiz for this unit. Actually, when I was solving the problem I was kind of scared but that was because it was pretty easy and straightforward. It was very similar to a lot of the problems on the weekly quiz so I thought the pre-lab quiz was another great opportunity to practice for the unit exam.
When we poured the water into the CuCl2 it kind of changed colors which was really cool. Then, when we put the iron nail into the solution, we immediately saw a color change in the nail which was cool because we could already see the reaction taking place.
When we came in for the second day of the lab, there was a dramatic change and that really helped me see the chemical reaction occurring. The process for the second day of the lab was very tedious and we had to be really careful not to pour out copper when we were trying to take the water and the hydrochloric acid out of the solution. However, I understand why it is so important to not wash away any of the copper because the final mass is what will help us determine the charge of the iron that reacted with the chloride. If we wash away too much of the copper on accident, we will get a smaller mass which will give us a different percent yield which will indicate the incorrect charge of the iron.
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