Stoichiometry Lab Report

David Francisco
Ms. Hansen
H Chemistry 3
10 January 2015
Stoichiometry Lab Report
What is the actual yield compared to the theoretical yield of copper from the single replacement reaction of Fe + CuSO4Cu+FeSO4?

Purpose: Determine theoretical yield of copper within the experiment using provided materials and analyze difference between the actual and the theorized yield.

IV: Amount of Iron (Fe)
DV: Mass of Copper (Cu)
Control: SO4 (Sulfate)

Materials:
-Distilled Water -Coffee Filter
-Hot Plate -2 Beaker
-Digital Scale -Tongs
-Goggles -Cylinder type item (filter holder)
-6 g CuSO4x5 H2O solution -1 g iron powder

Procedure:
1. Fasten those Safety Goggles
2. Place all materials: CuSo4/w paper, CuSO4, Paper (for CuSO4), Fe/w paper, Fe, …show more content…
Within the lab/experiment, the chemical compounds were measured before the increase in thermal energy by the hot plate was done. Thereafter, we mixed in the compounds inside the 100 mL of water and had it heated and then filtered for copper using a coffee filter. However, a waiting period of one day was needed due to factors such as the class period and school schedule and after that day we measured the amount of copper left in the coffee …show more content…
However, the next day it was found that 1.145 g of copper was left within the coffee filter, through calculations it was found that the percentage yield was 108% which lead to confusion and speculation among the group. Within the classroom, it was found that calculations were actually similar to an observable 50%+ of the class in which the yield was higher than the theoretical yield. However, it is not possible to have a higher yield than theoretical yield unless something went wrong in calculations or experimentation 0_0. Therefore, a large percentage of the class made an error in some part of experimentation or may be a slight flaw in procedures. Three possible sources include error in recording masses, improper drying of filter paper, and not recovering all of the copper from the beaker. Errors in recording masses may include such as the loss of substance when handling or accidental adding of a substance during experimentation to which would obscure results. Improper drying of the filter paper may be of cause as there is slight chance that moisture did not completely leave the area of the coffee filter and iron. Lastly, the recovery of copper from the beaker may be a contributing factor to an error to be made when doing this lab/experiment as it was noticeably hard to recover slight bits of the copper

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