• 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

Investigate the effect of the amount of sodium chloride, i.e. concentration gradient, in the aqueous solution on the electric current during electrolysis.

Extracts from this document...

Introduction

Planning Background When an electric current passes through sodium chloride solution, chemical reactions take place at both cathode and anode. If one passes through sodium chloride solution, there will be passage of ions moving through this solution. This results in positively charged sodium ions, which have been dissolved into the solution, moving towards the cathode and deposited there. At the same time, negatively charged chloride ions will be moving towards the anode and discharged at the anode. This is called electrolysis. Aim of experiment My aim is to investigate the effect of the amount of sodium chloride, i.e. concentration gradient, in the aqueous solution on the electric current during electrolysis. Key Factors/ variables that affect the results of the experiment The experiment carried out aimed to monitor the current during electrolysis when the amount of sodium chloride was changed. To ensure a fair test, only one of the listed key variables is allowed to change at a time with the rest of the variables are kept constant." This will give me an accurate set of results, which, I hope, enables me to make a decent conclusion. If we do not control the factors apart from the concentration we are testing, you can turn around and say that it was the other factors that had caused the difference and that it had nothing to do with the concentration. ...read more.

Middle

I don't think it's a large problem for me because a chose 5A for my experiment, unless I accidentally turned it the wrong way, I should not think that it will happen. Finally as this experiment involves electricity, electric shocks might occur. I will be careful and avoid possibilities of getting the shock, for example, using wet hands to touch the wires and before using the wire, check if it is safe, i.e. no holes. Sodium Chloride, i.e. salt, is not believed to present a significant hazard to health. Therefore, I do not need to be so cautious, but that doesn't mean being careless. I will wear safety goggles, if the electrolysis reaction is too vigorous. Evidence Collected My measurements of the experiment are shown in the table below: Concentration(g) First Test(A) Second Test(A) Third Test(A) Average(A) 5.0 0.22 0.22 0.22 0.22 10.0 0.42 0.33 0.31 0.35 15.0 0.54 0.34 0.39 0.42 20.0 0.59 0.38 0.52 0.50 30.0 0.60 0.57 0.58 0.58 I believe that these results to be accurate and reliable as measurements in the same tests are quite similar and they all go in sequence. All of the experiments follow the trend that the higher the concentration, the larger the current. E.g. At 5g, the current is 0.22A and at 30g, the current is 0.58A. ...read more.

Conclusion

This might contaminate the solution. I think I should use a new pair of electrodes when I do the repetitions. Also, I think I should have used the same top pan balance when weighing, as there may have been slight differences between the two balances. The above reasons are what could explain the anomaly in the graph. To further improve my experiment and add additional conclusive data, I would test a larger range of concentrations, for example, from 0g of sodium chloride to 35g of sodium chloride. This would give a larger range of data for me to analyse and draw a conclusion from. I can also, use a larger voltage, e.g. 8V. I used 5V in my experiment, but found that it did not give me a wide range of current. I gathered from other fellow students' investigations, that 8V has a better result. I am also quite interested in seeing what time has to do with electrolysis. I am considering this factor for further work. Actually, the result I gave in the observation part was my second attempt of getting the results. At first, I made a mistake by using the same solution 3 times to get the result. The results decreased after each attempt, therefore I realize that time must have something to do with the current. I think this is because if there is more time, the sodium ions will have more time to deposit. I can also investigate other variables such as temperature and surface area. ...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. Marked by a teacher

    How the Concentration of Sodium Thiosulphate affects the Rate of Reaction

    come out of the beaker during the experiment, one must still be cautious of spills.

  2. Electrolysis of Sodium Chloride - NaCl.

    I must ensure I wear safety goggles during the experiment because the solution could become vigorous and begin to 'spit', so I would need to protect my eyes fromt his. Preliminary testing My target in the preliminary test was to familiarise myself with this experiment.

  1. Electrolysis: How Does Current Affect The

    + 2e- Cu (s) 2 mol of electrons are needed to liberate 1 mol of Copper, so 0.000621761 mol of electrons will be needed to liberate 0.00031088 mol of Copper. So the mass of 0.00031088 mol of copper is: Mol of Copper * Molecular Weight = Mass of Copper 0.00031088

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

    I also stated that as the electric current increases, the amount of copper being released from the copper anode would also increase because more electrons are being drawn from the anode and taken to the cathode so positive copper ions are attracted to the negative cathode and therefore leave the anode and go to the cathode.

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

    negative electrode - The cathode - and the metal ions would be attracted to the positive electrode - The anode. For this reason we call the metal ions "cations" (from 'Cathode') and the non-metal ions "anions" (from 'Anode'). We know that the amount of electricity in the circuit affects the

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

    At the cathode, they become lead (II) ions. Lead Bromide is an uncharged substance because there are two Br- ions for each Pb2+ ions. The formula is PbBr2. When the lead bromide is solid it does not conduct electricity. This is because when the salt it a solid the ions cannot move.

  1. Investigating the effect of the temperature of hydrochloric acid on its rate of reaction ...

    Attach delivery tube bung to the top of the boiling tube, and the place other end of the delivery tube inside a water-filled syringe. ix) Add 2g of CaCO3 to the solution, and start the stopwatch. x) Time 30 seconds, and after this period take a reading of how much gas is inside the syringe and record this.

  2. Are Electric Cars better for the Environment?

    For many Ontario drivers, electric vehicles will offer an attractive alternative that will meet their needs and expectations. Environment There is no noise pollution which is a positive thing for the environment as for the gas cars they produce Co2and noise pollution which causes disruption to the wildlife and for residential areas.

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