• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10

Electrolysis - study the effect of current upon the mass of nickel deposited at the cathode.

Extracts from this document...

Introduction

Electrolysis Prediction I have decided to study the effect of current upon the mass of nickel deposited at the cathode. I think that as you increase the current the mass of nickel deposited at the cathode will increase in proportion. Also that the mass loss at the anode will be equal to the mass gained at the cathode. Obtaining Current (A) Mass of cathode at start (g) Mass of cathode at end (g) Increase in mass of cathode (g) Mass of anode at start (g) Mass of anode at end (g) Decrease in mass at anode (g) 0.2 1.331 1.306 1.340 1.383 1.355 1.390 0.052 0.049 0.050 1.32 1.352 1.347 1.280 1.294 1.293 0.052 0.058 0.054 0.4 1.530 1.501 1.435 1.640 1.594 1.522 0.110 0.093 0.087 1.520 1.461 1.395 1.411 1.345 1.290 0.109 0.116 0.105 0.6 1.475 1.521 1.395 1.620 1.651 1.535 0.145 0.130 0.140 1.520 1.385 1.482 1.326 1.224 1.327 0.194 0.161 0.155 0.8 1.385 1.372 1.435 1.548 1.542 1.604 0.163 0.170 0.169 1.432 1.501 1.395 1.204 1.300 1.180 0.192 0.201 0.215 Any anomalous results I find I will not include in the calculation for the average. I have highlighted any anomalous results. ...read more.

Middle

The reaction taking place at the cathode is: Ni2+ + 2e Ni Electrolysis is the flow of electrons, which splits up a compound using electricity. The ions only start to move when current is present and when they become charged, this allows them to move when they become molten or a liquid. In our case the nickel sulphate solution. The cathode is negative; it attracts positive ions (nickel). When the nickel reaches the cathode they pick up electrons from the cathode and turn into neutral atoms. As you can see in the above equation this has happened. The nickel has a 'plus 2' charge and has been attracted to the cathode because its negative. The nickel has picked up two negative electrons to make the nickel neutral. I have drawn a diagram below to try and help to understand the reaction better: The accuracy is very versatile due to the wide range of error that could occur. The amount of error occurs more when the current increases as you can see from my results. Current (A) Average Increase at cathode (g) Average decrease at anode (g) 0.2 0.0503 0.0546 0.4 0.096 0.11 0.6 0.138 0.158 0.8 0.167 0.202 The theoretical values have such a difference to my actual results because of the area of error, because some ions and atoms of nickel were lost. ...read more.

Conclusion

I would do this by using more accurate current equipment. I could also make sure the nickel cathode was completely dry before I weighed it. I could perhaps dry it with a hair dryer or just simply leave it for longer so the liquid has more time to evaporate. Another way to make my results more accurate is to make sure the electrodes are parallel by using a spirit level. I could also make sure the electrodes are at the same depth each time. Other extra experiment I could do to support my conclusion more strongly is perhaps using a different metal like copper instead of nickel. I would have to keep all the input variables the same as what I did for nickel. I would have to find the theoretical value for copper and then do the same and then compare the two results and the two graphs to see if they are similar. If they are then it would back up my conclusion. Another experiment would be to use a higher concentration of nickel sulphate solution. This would back up my conclusion if the results were similar. I would have to keep all the variables the same but change the concentration of the solution. I would again make a table of results and a graph and compare the two. (MB) Set 1 30/04/07 Sam Rogers 11CB ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Changing Materials - The Earth and its Atmosphere section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Changing Materials - The Earth and its Atmosphere essays

  1. Peer reviewed

    To find out how current affects the rate of electrolysis

    3 star(s)

    Method: 1. Check to see if all the apparatus work by forming a small circuit with a bulb 2. Collect apparatus and set them out like the diagram Ensure that the positive wire leads to the anode and the negative leads to the cathode.

  2. Investigate the factors that affect the mass of Copper deposited on the Copper Cathode ...

    In fact when using the current 0.6A the average amount of copper deposited on the cathode was 0.24g, which is equal to my theoretical value. In contrast to this I also acquired some anomalous results, which means that with my graph of experimental results the straight line going though the

  1. Electrolysis: How Does Current Affect The

    They were almost the same, so that ensured that I was working correctly. I think I may have got the anomalous results because the multi- meter switched off during both those test, so that may have made a difference.

  2. The Electrolysis Of Copper (ii) Sulphate Solution Using Copper Electrodes

    This is not the case at all since the latter turned out to be the second most accurate set of results; the first was predictably that which involved the smallest amperages and smallest temperature rises and hence the smallest effect on rate of reaction.

  1. Investigation to show how the amount of electric current affects the amount of copper ...

    Below is a line graph showing the average change in mass of the cathode: As can be seen, the line of best fit in the graph above goes through all the points plotted. This shows that my results are very accurate and that my predictions are right.

  2. Investigate how the rate of electrolysis is affected when changing the current in the ...

    rate of electrolysis, as Faraday says in his first law that the amount of electricity in the circuit is directly proportional to the rate of electrolysis. In electrolysis, the amount of substance at each electrode is stated in a Faraday's law, which states that the quantity if material transformed at

  1. Investigate the effect of the amount of sodium chloride, i.e. concentration gradient, in the ...

    Also, a voltage of 10A is a high voltage. I have to make sure through out the experiment; the voltage should be less than 10A.

  2. Electrolysis - The aim of this experiment is to prove that by passing electric ...

    The Cl atoms then join up in pairs to form molecules of chlorine gas Cl2 These equations show that Na+ ions remove electrons from the cathode, and Cl- ions give up electrons to the anode during electrolysis. The electric current it being carried through the molten sodium chloride by ions.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work