Stoich Lab Day 3

After washing the copper we obtained, we ended up with our final product which we later measured along with iron nail. We used these measurements to calculate the theoretical amount of copper as well as the actual amount of copper. Using this data we were able to determine the final solution which was iron chloride 3.

Here is a photo of our gross copper product.

Stoich Lab Day 1

This lab was very interesting. We started out with an iron nail and put it in a jar of copper chloride 2. The purpose of this was to get the iron to react to the chlorine and then it would separate the copper alone. After putting the nail in the solution, we left it sit for a day to let the copper separate.

These are just a few photos of the solution and the iron nail sitting in the solution.

Percent Yield

This lesson was very simple. Percent yield is taking the actual measured amount of a substance and dividing it by the theoretical amount in order to get a percent. Sometimes this percent can be over 100%. See here for more info. It was a very easy concept. I like how easy this unit is so far. The link under the photo has a great explanation and video about percent yields.

http://socratic.org/questions/what-is-the-percent-yield-of-the-following-reaction-if-60-grams-of-caco3-is-heat

This Kahn Academy article gives a great explanation about limiting reagents and percent yields. Click here.

Intro to Stoichiometry

We have reached our last section for the semester. Stoichiometry has to do with finding masses of certain reactants or products by using the mass of a given substance. It's a very useful tool when trying to find a theoretical mass of a product before your experiment begins. The method is done by taking a starting mass of a given substance and converting it to moles. Next, you multiply it by a mole ratio of the substance you want and the given. Finally, convert the new substance to grams and you have the answer. It's a very simple concept. Check out the link under the photo for more info as well as this link here.

http://www.chemtutor.com/mols.htm

Also check out this awesome video here from Kahn Academy.