Plan for an electrolysis experiment to determine the relationship between the current and the amount of metal deposited at the cathode.

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NAME        :        NABILA FATHA BINTI MOHD NOR MIMBAR

CLASS        :        M12G

TITLE        :        FACTOR AFFECTING THE ELECTROLYSIS

DATE        :         September 14, 2013

INTRODUCTION

        Electrolysis is the decomposition of a molten or aqueous compound by electricity. The electrolysis process occurs only in liquids called electrolytes. If the electrolytes is in molten or aqueous state, there are presence of mobile ions which allow current to flow in the electrolyte. Thus, electrolyte can conduct electricity but not in solid state.

Example        :        Diagram below show the ions present in an electrolyte in different state.

AIM

RESEARCH QUESTION

There are many factors that affect the mass of metal deposited on the cathode which are surface area of electrodes, concentration of electrolyte, time, current and temperature. Thus, in this experiment, the current used in the electrolytic cell is chosen as the manipulated variable to determine the relationship between the current and the amount of metal deposited at the cathode. The selected type of electrode and electrolyte are copper and 1.0M copper (ii) sulphate solution.

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HYPOTHESIS

The amount of copper deposited at the cathode is directly proportional to the current.

VARIABLES

Table 1        :        the independent and dependent variables of the experiment

Table 2        :        the method of how to control the constant variables

MATERIALS AND APPARATUS

Table 3        :        the materials for the experiment

Table 4        :        the apparatus needed in the experiment with the uncertainties

PROCEDURE

  1. Set up the apparatus as shown in the diagram above.
  2. Clean one of the two copper electrodes with emery paper on a wooded mat to remove impurities such as oxide layers and grease also to ...

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