Group+1

toc =Title: Reaction 6=

= =
 * zinc(s) + copper sulphate(aq) ---> zinc sulphate(aq) + copper(s)**
 * Will the Concentration of Copper Sulphate Affect the Mass of Copper Produced?**
 * Zn + CuS ---> ZnS + Cu**

The aim is to find out if different concentrations of copper sulfate affect the mass of copper produced.

Hypothesis:
If the concentration of copper sulphate increases, then the mass of copper created will also increase. This is due to the collision theory which states that chemical reactions take place when particles collide into each other. Meaning that by increasing the amount of particles, more collisions will take place, creating a larger reaction. In order to learn more about the collision theory, please visit http://en.wikipedia.org/wiki/Collision_theory.

Independent:
The concentration of the copper sulphate solution.

Dependent:
The mass of copper created.

Control:
Pieces of zinc used, solutions all at room temperature.

Materials:

 * Pyrex test tubes
 * pieces of zinc
 * different concentrations of copper sulphate
 * temperature probe
 * laptop
 * stopwatch
 * electronic balance
 * filter paper
 * funnel
 * tweezers
 * flask
 * pipet
 * labeler
 * sharpie

[[image:DSC02002.JPG width="249" height="183"]][[image:DSC01999.JPG width="261" height="183"]][[image:DSC02011.JPG width="269" height="183"]]
1. Label 4 Pyrex test tubes (1.0 M solution, 0.8 M solution, 0.6 M solution and 0.4 M solution) 2. Using a pipet, pour 10 mL of copper sulphate for Test tube #1 (1.0 M solution) 3. Using a pipet, pour 8 mL of copper sulphate for Test tube #2 (0.8 M solution) and 2 mL of distilled water 4. Using a pipet, pour 6 mL of copper sulphate for Test tube #3 (0.6 M solution) and 4 mL of distilled water 5. Using a pipet, pour 4 mL of copper sulphate for Test tube #4 (0.4 M solution) and 6 mL of distilled water 7. Set up a temperature probe for each labeled test tube. 8. Set intervals to collect data every 20 seconds for 15 minutes. 9. Press "collect" and while adding 3 granules of Zinc into each labeled test tube at the same time. 10. While collecting data, stir each test tube equally in order to speed up the rate of the reaction. 11. Set up and label 4 flasks and add one piece of filter paper to each. 12. Pour the contents of the test tubes into the filter paper according to the labels. 13. Add additional distilled water to speed up the filtering process. 14. Use a spatula to carefully remove any unreacted zinc. 15. Label each filter paper and leave the copper in the filter paper to dry overnight. 16. When dry, use tweezer and a small brush to pick up the remaining zinc and scraping off the copper and despose. 17. Put a new filter paper onto the electronic balance and zero the balance. 18. Scrape the copper on to the new filter paper and mass the copper. 19. Repeat the steps again for the different amounts of the 3 remaining copper values. 20. Collect the results of each on a peice of paper.



Data Collection:
As the experiment began, the copper sulphate solution was a clear blue. Once the zinc was added to the solution, the chemical reaction began, slowly turning the solution green. Copper formed on the zinc and eventually broke off, mixing with the aqueous solution. This is how we recognized that a chemical reaction was taking place.

Results:

Table 1: Different Concentration of Copper Sulphate and the Mass of Copper Produced

Data Processing:
The Concentration of Copper Sulphate and the Mass of Copper Produced has a positive relationship. When the Concentration of Copper Sulphate increases, the Mass of Copper Produced also increases.

Conclusion:
We did discover whether or not the concentration of the copper sulphate solution effects the amount of copper created. Our hypothesis was proven correct. The concentration of the copper sulphate solution does effect the amount of copper created. The higher the concentration of the copper sulphate solution, more amount of copper is created. This is shown by the data we collected showing increasing amounts of copper as the concentration of copper sulphate increased.

Evaluation:
In the first experiment, we used different volumes of solutions in the experiment. Since you cannot change two variables in an experiment, only one, this does not qualify and we had to re-start experiment to control factors correctly. There were several possible sources of error made in this experiment. Firstly, the filter paper wasn't massed beforehand. This was an experimental error since the mass of filter paper is different for each one. Secondly, as we were collecting the temperature of the solution, more than two people were stirring at different times and one stronger than another so therefore the result isn't accurate as possible.

This experiment could be further carried out in order to create a consistent set of results. From those results it would be possible to estimate what percentage the copper increases by as the concentration of copper sulphate increases. Also, we did not experiment to see if by increasing the amount of copper sulphate, we could also increase the amount of copper created.