Observation Report Estimating the duration Redox Reaction

I. Destination
Knowing the relationship influence the color change before and after reaction with use traditional course of the reaction with evidence of the potential price of the cell.

II. Materials and tools
• 5 pieces of test tubes
• 1 piece of test tube rack
• Table cell potential price
• 1 piece of metal Mg, Zn and Pb
• 2 pieces of metal Cu
• A solution of HCl
• CuSO4 solution
• solution of ZnSO4
• A solution of Pb (NO3) 2


III. How it Works
1. Prepare 5 pieces of test tubes.
2. Wash clean test tube.
3. Putting all five pieces to the shelf test tube reaction tabunng
4. Incorporating approximately 5ml (or to taste, can be seen from the reaction):
• HCl solution into the first tube
• CuSO4 solution into the second and third tube
• ZnSO4 solution into the fourth tube
• A solution of Pb (NO3) 2 into the fifth tube
5. Setting up the pieces of Mg, Zn, Pb and Cu, then enter:
• Mg metal into the first tube. Observe and record what has happened.
• Zn metal into the second tube. Observe and record the color change logan and solution before and after the reaction.
• Pb metal into the third tube. Observe and record the color change logan and solution before and after the reaction.
• Cu metal tube into the fourth. Observe and record the color change logan and solution before and after the reaction.
• Cu metal tube into the fifth. Observe and record the color change logan and solution before and after the reaction.
See the following picture:

Mg Cu Zn Pb Cu



HCl CuSO4 CuSO4 ZnSO4 Pb (NO3) 2

IV. Observation
1. Reaction of Mg metal with HCl
Color before Color after
Mg Gray black White long gone
HCl Bening Stay clear clear clear

2. Reaction of metal pendesakan
Tube to a metallic-color Observations Observations color of the solution
before after before after
2 carat Color Gray, long devastated Blue Light blue nodes for long clear
3 Silver Somewhat clear black Blue Light blue long clear
4 Yellow gold Yellow gold Bening Bening lucid lucid
5 Yellow gold Yellow gold Bening Bening lucid lucid

V. Conclusion
The color change before and after the reaction takes place to determine whether or not a reaction.
• If the color of the reaction solution before and after the change, meaning the reaction can take place.
• If the color of the solution before and after the reaction remains, meaning the reaction can not take place.
This can be evidenced by the price table cell potential, namely:
• If the price of a reaction after the cell potential is calculated, the price is positive means that the reaction can take place.
• If the price of a reaction after the cell potential is calculated, hargany negative reaction means that it can not take place.

VI. Answer Questions
1. Among the five trials that I observe,
• The reaction can take place is the group 1, 2, 3.
Ø HCl (aq) + Mg (s) + H (s) + MgCl (aq)
Ø CuSO4 (aq) + Zn (S) Cu 2 + (s) + ZnSO4 (aq)
Ø CuSO4 (aq) + Pb (s) Cu2 + (s) + PbSO4 (aq)
• The reaction can not take place is the group 4 and 5.
Ø ZnSO4 (aq) + Cu 2 + (s)
Ø Pb (NO3) 2 + Cu 2 + (s)
2. a. Potential price of each cell:
• HCl (aq) + Mg (s)
H + Eo = Eo - Eo Mg2 +
= 0.00 - (-2.375) = +2.375

• CuSO4 (aq) + Zn (S)
Cu2 + Eo = Eo - Eo Zn2 +
= +0.34 - (-0.763) = +1.103

• CuSO4 (aq) + Pb (s)
Cu2 + Eo = Eo - Eo Pb2 +
= +0.34 - (-0.126) = + 0.466

• ZnSO4 (aq) + Cu (s)
Zn2 + Eo = Eo - Eo Cu2 +
= -0.763 - (+0.34) = -1.103

• Pb (NO3) 2 + Cu (s)
Pb2 + Eo = Eo - Eo Cu2 +
= -0.126 - (+0.34) = -0.466
b. There is a relationship between cell potential price of the course of a redox reaction.
• If the potential price of cells positive (> 0), meaning the reaction can take place.
• If the potential price of cells positive (> 0), meaning the reaction can take place.