Mass and Chemical Reactions Lab

Topics: Stoichiometry, Yield, Aluminium Pages: 3 (745 words) Published: May 19, 2013
Mass Relationships in a Chemical Reaction Lab
Introduction: This lab focused on mass relationships within a chemical reaction. To understand this lab first, it is necessary to understand the reaction that is going on in the reaction. The Copper (II) chloride hydrate reacts with Aluminum to produce Aluminum chloride, copper, and water. Theoretical yield and various other forms of yield must be understood too, theoretical yield is what amount of the product you should get theoretically according to your calculations; experimental yield is the product you get after you finish the experiment. Because of error usually your experimental yield will be off from your theoretical yield. Percent yield is the efficiency of the reaction to get to the theoretical yield. Data Collection And Processing:

Raw Data:
Table #1 : Substance / Object and Mass Table
Substance / Object| Mass (± 0.01 g)|
200mL beaker| 67.38 ± 0.01 g|
200mL beaker + Copper| 69.39 ± 0.01 g|
Copper| 2.01 ± 0.01 g|
200mL beaker + Dried Copper| 68.01 ± 0.01 g|
Dried Copper| 0.63 ± 0.01 g|

Qualitative Data:
Before the reaction, the Copper (II) Chloride hydrate is a blue crystallized substance, the Aluminum was shiny and made crinkly sounds, it has a smooth metallic feel to it. During the reaction initially when stirred the water the water turns blue. When the aluminum is placed into the hydrous CuCl₂ the water becomes a darker murky substance. Steam is coming out of the water and aluminum is visibly dissolving. The aluminum is also turning black and vapor is forming along the sides. Foam like red pieces are forming and dropping. As the solid turns completely red the liquid is becoming clear again and is colorless. The foam like copper is sinking to the bottom and after reheat it became darker red and looks mostly dry. After a few days the copper is a brownish paste that’s dry and the chlorine is a turquoise dry substance. Processed Data:

First determine the theoretical yield...
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