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

Investigation into the factors affecting the current through an electrolysis cell

Extracts from this document...

Introduction

Investigation into the factors affecting the current through an electrolysis cell

Having looked at methods of mineral extraction we saw that one method involves electrolysis. To control the products of electrolysis we may need to control the speed of the reaction. A measure of this is the current of flow of electricity.

Preliminary Work:

We conducted preliminary tests in order to become familiar to the method we were to use in the final experiment. The results we gathered gave us an idea on the results and their range to enable us to draw appropriate graphs with correct scales. Equipment was chosen and we were to use the same in our main tests. So the preliminary tests would give us time to figure how to work them. This is done so the main experiment could be set up and completed successfully.

Possible Variables:

From the preliminary tests and results we found a number of possible variables we could have used to investigate the factors affecting the current through an electrolysis cell. These are:

  • The applied voltage
  • Concentration
  • Amount
  • Type of electrode
  • Size of electrode
  • Distance between electrodes

...read more.

Middle

Fig.1 shows that there are a greater amount of electrons at the anode and cathode when the voltage is higher. The greater amount of electrons, the greater amount of current.

Method:

Apparatus:

  • Electrolysis cell
  • Power pack (max: 12v)
  • Voltmeter
  • Ammeter
  • Clamp Stands
  • Leads

Diagram:

  • Set up apparatus as above, making sure that the voltmeter is connected in parallel, and the ammeter in series
  • Fill electrolysis cell with 100ml of potassium nitrate
  • Set power pack to certain voltage
  • Turn power on for short amount of time and note the real voltage and current
  • For better results, replace potassium nitrate solution after every reading
  • Do this for each voltage listed in the variables section
  • Repeat three times and take averages for best results
...read more.

Conclusion

Fig.2 shows what I predicted in my prediction. When the voltage is low, the current is low, when the voltage is high; the current is proportionally high, taking into account the resistance.

Evaluation:

The experiment was conducted well and fairly. All measurements were taken accurately using a syringe or measuring cylinder.

Although the results were reasonably accurate, and they supported what I said in my prediction, there was one slight anomaly. As you can see in my graph, the current apparently starts to rise at around 2.40/2.5V. This is not correct because voltage and current are proportional, and this means that they should both start at 0 in a graph. The most probable reason for this mishap is the accuracy of the ammeter, the readings were probably two small for it to read, or they were jumping around a lot, and this results in incorrect readings.

If I were to repeat this experiment, I would obtain a more accurate ammeter, and also use a rheostat, so I can achieve rounded voltages, that are the same for every repeat. This would make the experiment fairer, and the results more accurate.

Philip Crockatt

Investigation into the factors affecting the current through an electrolysis cell        -  -

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics 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 AS and A Level Electrical & Thermal Physics essays

  1. Marked by a teacher

    Internal Resistance of a cell

    5 star(s)

    and (0.60, 0.62) Slope = internal resistance (-r) Thus the internal resistance is -1.15 ? B) Coordinate of the error line: Hint: Y = mx + c since and r and ? are both constants = (0.00, 1.35) and (0.6, 0.55) so: -r is the gradient of the graph (m)

  2. A2 Viscosity investigation

    Radius2 (m2) Distance Travelled(m) Time taken (s) Average Velocity (ms-1) 1 2 3 899x10 203 x10 60x10 7.72 8.14 8.96 71.8x10 +or-4.8x10 634x10 101 x10 60 x10 11.14 12.01 16.73 45.1x10 +or-9.2x10 316x10 25.4 x10 60 x10 24.75 23.97 26.47 23.9x10 +or-1.2x10 199x10 9.80 x10 60 x10 55.09 55.67 56.07

  1. To investigate the effects of two different variables on a solar cell output.

    Below, I have analysed all the variables that could be investigated, and evaluated which one I will investigate. Variable 1: Light Light can have different colours, and different coloured lights are known to have different frequencies. This in turn would cause the different coloured lights to emit different levels of power.

  2. How does the mass of copper plated in the electrolysis of copper sulphate solution ...

    First of all, I have the a small current to start of with and so I can use the results of this value and compare it with the larger value(1 amp) and see what the kind of affect a small current has on the mass changes of the electrodes.

  1. Investigate the effects of two different variables on a solar cell output.

    Below, I have analysed all the variables that could be investigated, and evaluated which one I will investigate. Variable 1: Light Light can have different colours, and different coloured lights are known to have different frequencies. This in turn would cause the different coloured lights to emit different levels of power.

  2. Investigate the maximum power output of a solar cell (photovoltaic cell).

    The light is going to be connected to a retort stand so that I can vary the distance the light is from the solar cell. The voltage can be found out by using the formula, voltage = current x resistance, both of which I will know.

  1. Assess how changing the electric current in the electrolysis of acidified water affects the ...

    As changing the acid concentration is my chosen method for changing the current, the voltage will not be changed and will be kept constant at 7 volts. The voltage affects the current as volts measure how much electrical energy is given to each electron.

  2. Geothermal energy is not easily accessible with our current technology. Our main focus was ...

    The nuke would have to be placed at a depth of about 2 miles, which should be in the Earth?s mantle. Nuclear explosion can potentially reach temperatures in the millions of degrees Celsius. This tremendous amount of heat has the capability of producing a lot of magma but the explosions are highly destructive to the surroundings.

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