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

Investigation to Find the Resistance of Sodium Chloride

Extracts from this document...


Investigation to Find the Resistance of Sodium Chloride Plan The aim of the investigation is to find the resistance of different concentrations of sodium chloride, when electricity is passed through it. To make sure that the experiment is a fair test, only one variable will be changed. This variable will be the concentrations of the salt (sodium chloride) solution. The concentrations used will be 1M, 0.8M, 0.6M, 0.4M and 0.2M. The variables that will not changed and that will stay the same all throughout the investigation will be the amount of solution in the beaker, the depth of the electrolytes in the solution, and the setting on the power unit. I predict that the lower the concentration the higher the resistance. I will set up the experiment as shown in the above below. By changing one input variable, I will work out what effect changing that variable will have on the resistance of the salt solution. ...read more.


Also, in order to keep it a fair test, the input voltage, the area of the electrodes and the distance between the two electrodes will remain the same throughout the entire experiment. Other variables that may have some affect will be kept the same too if possible such as temperature etc. using a voltmeter and an ammeter to find the current and the voltage I will use the following formula to work out the resistance of the salt solution at each different concentration: Ohm's law states that R = V I Method A beaker was filled with 100ml of a range of different concentrations of salt solutions. Two electrodes were attached to the minus and positive terminals of a low voltage power unit. An ammeter was wired in series and a voltmeter in parallel to measure the current and the voltage of the circuit could be measured, this could then lead to the resistance being calculated. ...read more.


As the concentration increased the resistance decreased. The results make a smooth curve, but there is one result that may be anonymous. It was the 0.6M result. It is circled in green on the graph. From the graph I can conclude that a solution with a low salt concentration has a high resistance, whereas a solution with a high salt concentration has a low resistance. Evaluation I believe that the experiment was fairly accurate. Care was taken to ensure that the correct amount of solution was added into the beaker, and that the electrodes were in the same positions in the electrolyte so that an equal was in contact with the electrolyte. There was 1 anonymous result, which was different to the others. It is circled in green on the graph. I repeated each reading 5 times, to ensure that a reliable result was recorded. This could have been increased to produce an even more reliable result. The results on the graph show a smooth curve. ...read more.

The above preview is unformatted text

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. Internal resistance investigation - I will conduct the following investigation with the aim to ...

    At first it appears to be a perfect straight line, it then starts to curve slightly. This is because, after a while, all batteries start to deteriorate. The electrodes undergo chemical reactions that begin to block the flow of electricity.

  2. A2 Viscosity investigation

    As previously stated the timing will not begin until the ball has travelled a few cm and is at terminal velocity this is because the equations will only work at terminal velocity and if this is not the case the results will not be very accurate.

  1. Coursework To Find The Internal Resistance Of A PowerSupply

    Variables that could affect my experiment: The temperature of the power pack will affect the results obtained. If the power pack were at a low temperature, then its internal resistance would be less compared to a warmer power pack where its internal resistance will be higher.

  2. To find which of the circuits, shown below, are most suitable to measure a ...

    expressed as a percentage of the original 25000? is 33.3%. This is still quite a high value off the labelled resistance so I reflect that Circuit One is only accurate for relatively low resistances, but I concur that further calculations are needed, to investigate the matter further.

  1. Investigating the factors that affect the conductance of a solution

    to the one below: I predict the graph will have the following shape because when the concentration increases the conductunce is also incraesing at the same time. Hypothesis: What effect does different temperatures of the solution (ranging between 20?C to 90?C)

  2. Resistance of electrolyte

    Resistance 2 (?) Resistance 3 (?) Average Resistance (?) 13.8 13.9 13.8 13.8 13.3 12.9 13.3 13.2 12.4 11.4 12.0 11.9 11.8 10.6 11.0 11.1 10.3 10.1 10.1 10.1 9.4 8.9 9.1 9.1 8.5 7.8 8.1 8.1 6.3 6.7 6.6 6.5 From my results I can see that there is a relationship between the distance between the electrodes and the resistance.

  1. Investigate the factors, which could affect the current flowing during electrolysis of Sodium Chloride ...

    They therefore cannot move to the electrodes. Once they are dissolved in water, they are free to move in the solution. It is this movement that allows a current to flow. During electrolysis, the electrons from the battery go to the negative electrode where they meet the positive ions and are changed into neutral atoms.

  2. In this investigation, I will be looking at the resistance of a solution, and ...

    salt particles, the electricity will conduct better, because the electricity can pass through the solution easily, with more particles to travel across within the solution. I predict that the graph made with the results from my experiment will end in a horizontal line, this is because when more salt is

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