• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

An investigation to discover how the mass of deposited metal is related to the current that flows through an electrolyte.

Extracts from this document...

Introduction

Sarah Lee An investigation to discover how the mass of deposited metal is related to the current that flows through an electrolyte An electroplating company needs to know how the mass of deposited metal is related to the current that flows through an electrolyte. I have been asked to investigate... Possible input variables The size of current, metal at the electrode, concentration of solution, surface area exposed to electrolyte and the time exposed the metal is exposed may effect the experiment. Possible output variables If I change any number of the input variables the mass of the metal deposited at the cathode and the mass lost at the anode will be affected. My input variable I have decided to change the current that I pass through the electrolyte. My outcome variable I will need to measure or observe the mass of metal deposited at the cathode. My control variable To make my experiment fair, I will keep the concentration of the solution, metal at the electrodes, surface area of the metal exposed to the electrolyte and the time the metal is exposed the same each time I do the experiment. Scientific knowledge In the electrolysis of copper solution with copper electrodes copper is deposited at the cathode. There are positively charged copper ions in the copper sulphate solution, which are then attracted to the negatively charged cathode and deposited when they combine with +2 electrons. ...read more.

Middle

Record in a table the results and plot the average readings on a line graph[N1]. This is a table to show the amount (in grams) of copper deposited on the cathode during electrolysis Trial 1 Current in amps Mass before Mass after Total increase Observations 0.5 2.15 2.17 0.02 The total amount of 1.0 2.17 2.28 0.11 copper is increasing 1.5 2.28 2.46 0.18 2.0 2.41 2.62 0.21 A lot of copper is deposited on the 2.5 2.62 2.82 0.23 bottom 3.0 2.85 3.09 0.24 Pieces of copper are moving slowly towards the edges of the cathode Trial 2 Current in amps Mass before Mass after Total increase Observations 0.5 3.09 3.24 0.15 Copper moves much more slowly 1.0 3.04 3.24 0.2 Not a lot of copper on the surface of the 1.5 3.24 3.41 0.17 cathode 2.0 3.41 3.57 0.16 Lots of copper deposited on the bottom 2.5 3.57 3.82 0.05 3.0 3.82 4.13 0.31 The solution is beginning to get warm Current in amps Total average increase in grams 0.5 0.85 1.0 0.155 1.5 0.175 2.0 0.185 2.5 0.24 3.0 0.275 I am confident with my recorded results because I have taken enough accurate, repeated trials and used the equipment accurately to make reliable evidence of my experiment. I have taken extra observations of my experiment at various stages to improve my experiment results. ...read more.

Conclusion

I also took time to zero the scales so the measurements would be more accurate. I checked the wires to make sure they were covered, I wore goggles throughout the experiment and I washed my hands before and after the experiment. I have made some observations as I was carrying out my experiment, during both trials, excess copper was deposited on the bottom of the flask of solution therefore the results varied greatly between the trials because the amount of copper deposited on the bottom varied between the two experiments. Also obtaining the results for the experiment spanned over a couple of one hour lessons, even though I was very careful when putting the equipment away while putting away the cathode small amounts of deposited copper rubbed off therefore our results do not look quite right. As I have commented before, I feel my results are very accurate as I carried out my experiment methodically and recorded my results in a clear way. We took readings spanning from 0.5 amps to 3.0 amps. At each point I repeated it three times. Because points on my graph show good correlation there isn't an 'odd' point. I took many results, which were repeated, so I am confident that there are enough results to support my conclusion. To improve my experiment I would use, instead of a paper cathode, a small cylinder cathode so I could collected more deposit, which would make better more varied results. Other than that I feel my experiment was successful. [N1] ...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

    What is a metal ore?

    4 star(s)

    Cold work has the effect of increasing its tensile strength and hardness due to work hardening, but reducing its ductility. It possesses good corrosion resistance being protected by an oxide layer, which forms on its surface when it reacts with oxygen.

  2. An experiment to show how electroplating using copper electrodes.

    But there was room for improvement. Using the purest copper available could also make the results more accurate. By using a digital ammeter to secure a much more accurate reading on the current flow. Using the digital rheostat, to keep the current the same, the sliding rheostat is much harder to use as moving it to try and establish a constant current flow was very hard.

  1. Thermal Decomposition Of Metal Carbonates

    125g 1.25g Carbon 12 Oxygen �3 16�3 Copper CuCO3 Copper 63.5 63.5 + 12+ (16�3) 123.5 g 1.235g Carbon 12 Oxygen �3 16�3 Manganese MnCO3 Manganese 55 55 + 12 + (16�3) 115g 1.15g Carbon 12 Oxygen �3 16�3 Potassium K2CO3 Potassium �2 39 � 2 (39�2)

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

    Analysis From observing my results and graphs, the following pattern can be identified. On my results graph it can be seen that roughly if one doubles the current, the amount of copper deposited on the cathode will also be doubled, they are directionally proportional to one another as the line of best fit goes through the origin.

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

    is that copper deposits may have fallen off the electrode at various times: as it was being removed from the electrolyte, as it was being rinsed by distilled water, as it was being dried in acetone or just when being moved.

  2. Electrolysis: How Does Current Affect The

    When 0.2A was doubled to 0.4A, the results went from 0.3g to 0.6g. This shows that there were some direct proportionate results. My predicted results were not exactly the same as my final results, but they did show some similarities that as the current increased, so did the mass collected.

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

    Anode Before (grams) Anode After (grams) Change in Mass (grams) Cathode Before (grams) Cathode After (grams) Change in Mass (grams) 0.2 1.32 1.28 -0.04 2.15 2.19 0.04 0.4 1.54 1.46 -0.07 2.08 2.16 0.08 0.6 2.45 2.35 -0.11 1.55 1.67 0.12 0.8 1.95 1.80 -0.15 2.11 2.27 0.16 1.0 2.01 1.82 -0.19 2.25 2.46 0.20 (the minus sign indicates a decrease in mass)

  2. Factors affecting mass of copper transferred in Electrolysis of aqueous copper sulphate

    The graph also shows that the change in mass is also proportional to the charge however it is slightly off because the results are 0.01g out than they should be. The positive correlation is due to the fact that as the copper ions in the solution are broken from their

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