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

Investigating the Effect of Concentrations of Solutions

Extracts from this document...

Introduction

Investigating the Effect of Concentrations of Solutions Introduction In this experiment we will be investigating the effect that the concentration of salt in water has on the resistance of the solution. The possible variables I could use are as follows: Mass of salt, temperature, voltage used, volume of water used to dissolve salt. The input variable will be the amount of salt we mix in the solution, and the output variables resulting from this will be the current and the resistance. I have chosen to vary the amount of salt because I think that varying the mass of salt is easier and more accurate than varying the other variables. I am going to keep the test fair by only varying the amount of salt I put into the solution, by carefully weighing its mass electronically, and by carefully measuring the amount of water I use to dissolve the salt in each time with measuring cylinders, and also stirring the solution until all of the salt has disappeared to make sure that it is accurate showing how salt effects conductivity. I will also carry the test out at room temperature. The variables I am keeping constant are: * The input voltage used * The volume of water used * The temperature ...read more.

Middle

certain constants to be used for example I decided that 75ml of water was the best amount to use as any less wasn't enough to cover the anodes and keep its contact equal with the water. I also decided to keep the input voltage at 4 volts as this produced enough to give good results and didn't produce too much poisonous chlorine if kept on a little longer while taking results. Results next page:- Results Below is a table of the results I obtained and the results of my repeat. The temperature of the water was always constant at 21�C. The electrodes are kept 2cm apart in each test. Test 1 Test 2 Ave. Volume Of water (cm�) Mass Of salt (g) Voltage (V) Current (A) Resistance (?) Voltage (V) Current (A) Resistance (?) Ave. Resistance (?) 75 0.5 3.37 0.11 30.6 3.38 0.11 30.7 30.65 75 1.0 3.36 0.14 24.0 3.38 0.14 24.1 24.10 75 1.5 3.37 0.16 21.1 3.37 0.15 22.5 21.80 75 2.0 3.37 0.17 19.8 3.36 0.17 19.8 19.80 75 2.5 3.36 0.19 18.7 3.36 0.18 18.7 18.20 75 3.0 3.37 0.20 16.9 3.37 0.20 16.9 16.90 75 3.5 3.36 0.22 16.0 3.36 0.21 16.0 15.65 75 4.0 3.36 0.24 14.7 3.37 0.23 14.7 14.35 Analysis To ...read more.

Conclusion

This pattern suggests that my results are reliable. However, it would be preferable if the experiment could be carried further so that I could make sure of this pattern, but I didn't have enough time to do this. The problems of this experimental procedure are detailed above describing possible causes of the anomalous result, and problems could be improved by: * Reducing human error with more care and attention * Checking equipment for faulty connections, or using newer equipment * Using distilled or purer water for the experiment instead of tap water * More accurate scales running to more decimal points * More thorough cleaning of equipment after obtaining each result The experiment could be continued by using higher amounts of salt in the solution, until no more can be added (the solution is saturated), or even by using different solutions, like other salts, or effects of using acid instead of water etc. It would also be interesting to investigate the effects of using other salts, and whether they affect resistance similarly. All of these could provide more insight into the relevance of this experiment, and give a wider view of what material will allow the conduction of electricity. Jason Millman 11A ????? ...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. Assess how changing the electric current in the electrolysis of acidified water affects the ...

    From this point onwards the gradient of the graph would become 0. It has been found that an increase in the rate of electrolysis is directly proportional to an increase in current. During the electrolysis of acidified water, the positive hydrogen ions move towards the cathode and the negative hydroxide and sulphate ions move towards the anode.

  2. The electrolysis of copper from copper sulphate solution

    In conclusion I can say that the current in the electrolysis cell increases as the concentration increases, this is what I stated in my prediction, I said that the increase would be due to the collision theory. The theory is what my prediction was based on, the reason being, the

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

    Factors: When carrying out these experiments, I will make sure the only variables that vary are the ones that I am testing, and the others are kept constant. For the first experiment when I am keeping the distance between the lamp and solar cell constant and when I am varying

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

    Also I can investigate what other affect a small current has on the copper sulphate solution e.g. the increase in temperature. Secondly I have a constant amount of current increasing which makes it easier to calculate the changes of between each different experiment and so when I draw the graph I can see how the mass changes.

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

    We know that this is the case because when combining the two below formulae, we can see that energy and frequency are related. Wavelength x Frequency= Wave Speed Planck's Constant x frequency= Energy The second formula states that frequency is directly proportional to energy.

  2. Skill Area P - Planning experimental procedures.

    is different and therefore meaning that each colour has different level of energy. This is because Einstein's theory claims that the energy of each photon is directly proportional to the frequency of the light wave. E = h.f Energy = Planck's constant � frequency We can use the wave equation

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

    This is the electric circuit that takes place during electrolysis and is why I think that as you increase the concentration, the current will also increase. Planning I planned to set up the equipment as shown below: I am going to measure the current flowing through the circuit when I record my results.

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

    This will mean that it will have no affect on the resistance, which is affected by the salt concentration. Another thing which could affect the results, or change the experiment to show the results better, would be to use elements with a charge of 2+ and 2-, so that they will react.

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