• 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

# 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

# Related AS and A Level Electrical & Thermal Physics essays

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

Variable 2: Distance Distance Another variable that could be investigated with a solar cell is the distance between the solar cell and the light source, and the effect upon the energy transferred to the solar cell when varying distances between the solar cell and light source.

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

First of all you need to keep the time constant because if no time is recorded the charge in the experiment can't be calculated so keeping time constant in this experiment is vital. Another point is that we are going to keep the separation of electrodes the same distance apart.

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

by the wavespeed, to give a smaller figure, which when multiplied by the constant gives a smaller amount of energy. This means that light with a small wavelength and thus high frequency will give out more energy that lights with a large wavelength and low frequency.

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

The distance between the electrodes affects the current as the closer they are together the smaller the distance that the electrons, which carry the electric, charge have to travel. Thus, if the electrons have to travel a shorter distance through the solution, they will pass through it at a greater rate (current).

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. ## 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. ## 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.

2. ## In this experiment we are investigating the effect of concentration on the current flowing ...

Equipment Circuit Method 1) Set up equipment as shown. 2) Measure out 150ml of deionised water (deionised so that any ions already in the water will not interfere). 3) Weigh out 1g of copper sulphate crystals on the weighing scale (1g gram is suitable since in the pre-trial we found

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