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

Investigating a Factor Affecting Mass deposited at the Cathode during Electrolysis

Extracts from this document...

Introduction

Investigating a Factor Affecting Mass deposited at the Cathode during Electrolysis Aim The aim of this investigation is to find out what effect the independent variable time or current will have on the change in mass on the cathode, and the change in the mass on the anode. Hypothesis The independent variable I will be investigating will be time, in my experiment I will increase the variable by 5 minutes. I predict that when I increase the amount of time for electrolysis to take place, the mass on the cathode will increase, and the anode will lose mass for every minute electrolysis takes place. My quantitative prediction is that when I double the time the charge will double. I can prove my theory with my scientific knowledge and the equation Q = I � T. 'Q' is the charge which is related to the mass deposited, 'I' is the current and 'T' is the time. So when I keep 'I' and double the time it should prove my prediction correct. Q = I � T Q = 2 � 5 Q = 10 If I double the time 'Q' should double Q = 2 � 10 Q = 20 Because 'Q' is linked to the change in mass, if it is increased the mass will increase on the cathode. ...read more.

Middle

Another way I will keep my experiment fair is to keep the powerpack on the same voltage of ten volts, and at the end of each experiment I will takeoff the excess copper on the cathode. To be safe I will use goggles when pouring the copper sulphate solution. To be accurate I will need to use a timer so each experiment can be stopped and started accurately. Another way to be accurate is to use a digital scale, accurate to 2 decimal places. Plan Before we start the experiment we have to set up a circuit that includes a powerpack, ammeter which will be connected in series, stop clock, beaker, filter and electrodes in copper sulphate. Once I have the circuit ready, I need to cut two 5cm long copper electrodes out from a copper sheet and weigh them, once I have weighed them I need to record the weights. After the weighing I will complete the circuit with the copper electrodes and copper sulphate. Then when the circuit is complete I will turn on the powerpack and timer with the help of my partner. Once the experiment is over I will let the electrodes dry off and weight them again and record the results. ...read more.

Conclusion

Experiment 6 is void because the change in mass for anode is -0.09 but the change is mass is +0.44. The graph also allows me to see what has happened in each experiment for example, in experiment 2, I can see that 0.9 grams was lost by the anode but only 0.3 grams was gained by the cathode. This shows me that the rest of the mass was deposited in the bottom of the beaker. Evaluation From my results table and graph, I can see that there were many problems. Firstly time was a huge problem; we did not have enough time in lessons to conduct a 30 minutes experiment. Next time to overcome this I will not use such large time intervals I will use time intervals like 2 minutes. . My second problem was during the experiment the anode simply eroded too fast for the cathode o pick up the copper ions. This made my results more unreliable. To solve this problem next time I will reduce the voltage. I think these two problems let to the results being unreliable, because there are two results that are anomalous. I don't think it was the procedure of the investigation that made the results unreliable, so I would not change the procedure, because I used a timer and digital scale to make the experiments accurate. ...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. Factors affecting mass of copper transferred in Electrolysis of aqueous copper sulphate

    the final mass of the cathode more because there is more of a chance that more of a reaction will occur. I'm planning to take five results at intervals of two minutes for each set of data and then do two repeats so that the averages would be more accurate and hide any anomalies.

  2. Investigating how the amount of copper affects the mass of the cathode

    * Hair dryer, which will be used to dry the electrodes so that the water of the copper sulphate solution does not get weighed as well as the electrodes leading to an unfair test. * Glass beaker, which will be used to place the copper sulphate solution and the electrodes in.

  1. What Effects the Reaction in the Electrolysis of Copper Sulphate.

    My results for my experiment were as follows: Amount of Coulombs Experiment number Weight of anode at start (g) Weight of anode at end (g) Weight of cathode at start (g) Weight of cathode at end (g) Average weight change (g)* 100 1 1.01 0.98 1.01 1.04 0.03 2 1.00

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

    (sec) We know that 193000 coulombs of charge gives us 59g of nickel. Therefore to find 1 coulomb of charge we have to divide 59 by 193000. We would then multiply that answer by what part of the experiment we know.

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

    This also applies to my other currents such as 0.4A and 0.8A. Quantitative Prediction Since how the current affects the mass of copper deposited on the copper cathode is being investigated it is sensible to pick five different readings, 0.2 Amps, 0.4 Amps, 0.6 Amps, 0.8 Amps and 1.0 Amps.

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

    the electronic weighing machine in order to enable me to compare the weights of the electrodes after electrolysis with the weights before electrolysis. By comparing these weights, I will be able to work out the change in weight and thus find out how much copper has been deposited at the cathode and how much has been taken from the anode.

  1. Is an increase in traffic pollution the

    Some recent experiments challenge this belief. Scientists have shown that people exposed to ozone or nitrogen dioxide are more likely to react to allergens such as grass pollens and house dust mites than those who are not exposed. Also a combination of air pollution and allergens could cause some cases of asthma.

  2. Are mans activitys affecting global warming

    of fish due to pollution in waterways and the destruction of ecosystems. Animals, birds and fish have to adapt, move to other areas to survive or simply become extinct because of man's interference. It seems far off now, but ecological and economic impact on future generations will be catastrophic.

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