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Adda Rabiatul
Adda Rabiatul

This document contains information about electrode potentials and corrosion. Part 1 lists the potential differences between various metal electrodes in a sodium chloride solution. It also discusses how corrosion occurs when a more active metal is in contact with a less active metal. Part 2 provides the potential differences for a copper sulfate solution and a diluted copper sulfate solution, and explains how dilution affects potential difference by decreasing ion concentration in the electrolyte.

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DATA / ANALYSIS PART 1 Solution: sodium chloride solution. Group (terminal/electrode) sign/ Positive terminal Negative terminal potential different (±0.001)V Copper Aluminium +1.641 Copper Zinc +0.794 Copper Ferum +0.552 Numerical order from the most positive to the most negative. (potential) Aluminium Zinc Ferum Copper Metal increasing activity ANSWER FOR QUESTION IN PART 1 1. Voltage different for two any point in a circuit (terminal) makes current flow. 2. There is no different sign in potential different. 3.
4. - Higher potential metals will decompose a lower potential metal. Presence of oxygen or bubble in metal surface that undergoes corrosion process.(oxidation) - For corrosion to occur there must be a formation of ions and release of electrons at an anodic surface where oxidation or deterioration of the metal occurs. There must be a simultaneous acceptance at the cathodic surface of the electrons generated at the anode. This acceptance of electrons can take the form of neutralization of positive hydrogen ions, or the formation of negative ions. The anodic and cathodic reactions must go on at the same time and at equivalent rates. However, corrosion occurs only at the areas that serve as anodes. PART 2 Solution Potential different(±0.001)V Copper sulphate 1.00 Copper sulphate + tap water 0.03 ANSWER FOR QUESTION IN PART 2 1. When 100ml of tap water is added to 100ml copper (II) sulphate solution, the concentration of the solution is become more dilute. So it is will effect the reading of the potential different. 2. Electrode in less dilute solution is at higher energy level because if the concentration og ions in the electrolyte increases, then so will the potential different in the voltaic cell. (Less dilute, more concentration of ions is available).

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  • 1. DATA / ANALYSIS PART 1 Solution: sodium chloride solution. Group (terminal/electrode) sign/ Positive terminal Negative terminal potential different (±0.001)V Copper Aluminium +1.641 Copper Zinc +0.794 Copper Ferum +0.552 Numerical order from the most positive to the most negative. (potential) Aluminium Zinc Ferum Copper Metal increasing activity ANSWER FOR QUESTION IN PART 1 1. Voltage different for two any point in a circuit (terminal) makes current flow. 2. There is no different sign in potential different. 3.
  • 2. 4. - Higher potential metals will decompose a lower potential metal. Presence of oxygen or bubble in metal surface that undergoes corrosion process.(oxidation) - For corrosion to occur there must be a formation of ions and release of electrons at an anodic surface where oxidation or deterioration of the metal occurs. There must be a simultaneous acceptance at the cathodic surface of the electrons generated at the anode. This acceptance of electrons can take the form of neutralization of positive hydrogen ions, or the formation of negative ions. The anodic and cathodic reactions must go on at the same time and at equivalent rates. However, corrosion occurs only at the areas that serve as anodes. PART 2 Solution Potential different(±0.001)V Copper sulphate 1.00 Copper sulphate + tap water 0.03 ANSWER FOR QUESTION IN PART 2 1. When 100ml of tap water is added to 100ml copper (II) sulphate solution, the concentration of the solution is become more dilute. So it is will effect the reading of the potential different. 2. Electrode in less dilute solution is at higher energy level because if the concentration og ions in the electrolyte increases, then so will the potential different in the voltaic cell. (Less dilute, more concentration of ions is available).