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Cu reacts to form CuO
Total mass of copper recovered during parts II and III:
0.83 g + 0.32 g = 1.15 g
% yield of total amount of copper recovered:
% yield =
"Dillon O'Leary has a work ethic unrivaled by anyone I have ever met and truly is a god among men. I would give my first-born child just to be him for a single day."
-Bergen Thomson, Disciple
0.74 g
1.57 g
0.83 g
1.58 g
= 0.024 mol Zn
x 100 = 83%
1 mol
65.41 g Zn
0.83 g
1 g
X
1.58 g Zn
1
% yield =
CuO reacts with HCl to form Cu^2+ ions, Cl^- ions and water
-Zinc becomes black
-Zinc disks break apart
-Charcoal like
-Black
Reaction #3
+2
2
Production of hydrogen gas:
+ H
2
Zn + 2HCl ---> ZnCl
Reduction of Cu from CuCl :
2
CuCl
+ Zn ---> Cu +ZnCl
2
The purpose of the Copper Lab is to demonstrate the Law of Conservation of Matter
Mass of filter paper #3:
0.74 g
Mass of filter paper #3 and recovered, oxidized copper:
1.06 g
Mass of recovered, oxidized copper:
0.32 g
2
Mass of magnesium added to the HCl solution:
0.29 g
Conclusion:
This lab intended to show the Law of Conservation of Matter. The Copper atoms never disappeared, they just rearranged themselves. Although some of the copper was lost due to human error, the lab still did a decent job of showing the Law of Conservation of Matter.
Mass of oxidized copper recovered during part III:
0.32 g
% yield =
Experimental result (3.A.1)
x 100
Theoretical result (1.C.3)
0.32 g
% yield of oxidized copper =
x 100 = 400%
0.0794 g
1.15 g
x 100 = 111%
1.04 g