metal-metal displacement

Topics: Redox, Oxidizing agent, Chlorine Pages: 6 (1485 words) Published: October 10, 2013

INORGANIC CHEMISTRY 1

Lab Report on
Oxidation & Reduction
I. Metal-Metal Ion Displacement
II. Halogen Displacement Reactions

INTRODUCTION
A series of experiments had been conducted to determine the order of displacement strengths of the metals and halogen chosen for the experiments. A displacement reaction is a reaction in which one element(metal or non-metal) displaces another element(metal or non-metal) from its salt solution. In the displacement reaction of metals, the more electropositive metal will displace the less electropositive metal from its salt solution Through the observations of experiment results, aligning them with theory, oxidizing and reducing agents are distinguished.

DISCUSSION
Part A: Metal-Metal Ion Displacement Reactions

In the first set experiments involving metal-metal ion displacement metal-nitrate solutions were prepared first. Using the formula: Molarity=moles of solute
liters of solution
This formula was used in order to calculate the amount of metal-nitrate in grams that were needed to be weighed to produce the wanted metal-nitrate solutions. Below are the calculations involved for each metal

Mg(NO3)2
0.1M x 0.05L x 256.14gmol-1 = 1.2807 g
Zn(NO3)2
0.1M x 0.05L x 297.0 gmol-1 = 1.4850g
FeSO4
0.1M x 0.05L x 151.92gmol-1= 0.7596g
Pb(NO3)2
0.1M x 0.05L x 331.22gmol-1= 1.6561 g
Cu(NO3)2
0.1M x 0.05L x 230.02 gmol-1 = 1.1501 g

OBSERVATIONS
 
Mg(NO3)2
Zn(NO3)2
FeSO4
Pb(NO3)2
Cu(NO3)2
Mg Metal

Dark tiny substances (presumably Zn metal) dull the surface of Mg ribbon. Solution remains clear Tiny dark chunks of Fe metal formed on Mg surface. The yellow color of solution eventually fades Very small black bits of Pb metal formed on Mg ribbon surface Small amounts of Cu metal bits on Mg surface was observed, the intensity of the blue-colored solution reduced Zn Metal

No observable change occurred

The yellow color of solution eventually fades. Very tiny Fe metal deposited on Zn metal granules Small amounts of tiny dark Pb metal deposits were observed on Zn metal granules. The prominent blue color of solution fades. Very small amounts of Cu metal can be seen among the Zn granules Fe Metal

No observable change occurred
No observable change occurred

No observable change occurred. (Which is contrary to theory, will be further explained in discussions) The blue-colored solution loses its color intensity
Pb Metal
No observable change occurred
No observable change occurred
No observable change occurred

The blue-colored solution loses its color intensity
Cu Metal
No observable change occurred
No observable change occurred
No observable change occurred
No observable change occurred

(Note: All half-equations & overall equations that support the observations are located at the end of discussions) When Mg metal was placed into a solution of Zn(NO3)2 it had been observed that dark-colored tiny Zn metals dulled the surface of the Mg ribbon. The reason for this observation is because, Mg metal is a stronger reducing agent compared to Zn, therefore Mg has to ability to displace Zn2+ ion. While in a solution of FeSO4 tiny dark chunks of Fe metals can be seen on the Mg ribbon, which is accompanied by the decolourization of the yellow-colored solution resulting in a paler yellow solution (know that the yellow color of the FeSO4 is due to the presence of Fe2+). This also proves that Mg metal is more reactive than Fe metal. Next, in a solution of Pb(NO3)2 , Mg metal was able to displace Pb2+, since based on the observation little bits of Pb metal can be seen on the surface of Mg ribbon. Lastly in Cu(NO3)2 decolourization of the blue-colored solution was observed, this is due to the displacement of Cu2+ by the more reactive Mg metal (know that the blue colored solution is due to the presence of Cu2+ in Cu(NO3)2 solution)

As for the next metal, Zn metal, when placed into Mg(NO3)2 solution, there was no observable change, thus an indication...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Metals Essay
  • Metal Fabrication Essay
  • Essay about Metals and Non-metals Characteristics
  • Metal and Architecture Essay
  • Chemical Properties of Metals, Non-Metal Essay
  • Abundance And Extraction Of MEtals Essay
  • Metals and alloys Essay
  • Density of Metals Essay

Become a StudyMode Member

Sign Up - It's Free