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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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Introduction

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. ...read more.

Middle

sulphate solution 200ml Propanone A bottle region Distilled water A bottle Ammonia solution 50ml Tissue A role Emery paper 10 small pieces Table 3 : the materials for the experiment APPARATUS QUANTITY SIZE UNCERTAINTY Variable resistor 5 Standard size - Ammeter 5 Standard size ±0.1A Beaker 5 250ml ±0.5ml Power supply 5 Standard size - Red and black wire 20 Standard size - Stopwatch 5 - ±0.1s Crocodile clip 10 Standard size - Electronic balance 1 Standard size ±0.1g Wooden mat 1 - - 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 ensure that the copper cathode is pure. ...read more.

Conclusion

The resistor maintains a low and steady current. Left the apparatus for 20 minutes and the time was measured by using a stop clock. 9. After 20 minutes, remove the copper cathode from the copper (ii) sulphate solution. 10. Wash the copper gently with distilled water and propanone and then dry the cathode in the air. Remember not to rub the cathode. Distilled water is used to remove copper (ii) solution and the propanone is used to rinse away the water because propanone is a volatile liquid which it will quickly evaporate. 11. Re-weigh the cathode and record the mass thus the amount of copper deposited at the cathode can be calculated. 12. Carried the experiment with different current (0.2A, 0.4A, 0.6A, 0.8A and 1.0A) twice for each current. RESULTS / DATA COLLECTION Current, I (A) Initial mass of copper electrode, (g) Mass of copper electrode after 20 minutes, Mass of copper deposited, (g) 0.2 Trial 1 Trial 2 0.4 Trial 1 Trial 2 0.6 Trial 1 Trial 2 0.8 Trial 1 Trial 2 1. ...read more.

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