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

To investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid

Extracts from this document...

Introduction

GCSE Chemistry Coursework Investigation To investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Aim My aim is to create an experiment so that I can measure the difference in reaction rates when Sodium Thiosulphate and Hydrochloric Acid are heated. When Sodium Thiosulphate and Hydrochloric acid are mixed they react to form Sulphur. It is the Sulphur that makes the reaction cloudy and the experiment is to see how long it takes for this solution to become cloudy when heated at different temperatures. Factors Involved and Fair Testing This experiment will contain only one variable, the temperature. The constants are:- * The concentrations of the Sodium Thiosulphate and Hydrochloric Acid. Also the volumes need to be kept constant so to keep the investigation fair. * The apparatus used in the experiment needs to be kept exactly the same for each different temperature. If we use any apparatus that will need to be used in the next experiment we need to make sure that we wash them thoroughly so to avoid unnecessary reactions. I need to keep these constants unvarying to keep the experiment accurate. I should already know what measurements to use for my concentrations from preliminary experiments, for example, I know that I have to choose a concentration that changes fairly slowly at room temperature ...read more.

Middle

* The temperatures I have chosen are: * 10�, 20�, 30�, 40�, 50�, 60� * It is virtually impossible to get an exact temperature of, say, 20�, and so, because of this, I will measure the temperature just before the reaction begins and straight after it has finished so that I can get an average temperature to work with. While heating therefore I need to get as close to the desired temperature as possible at the start. * Once my solutions have been heated and equilibrated at the desired temperature I shall pour both solutions into the one beaker while at the same time starting the stop clock. The beaker shall then be put onto a piece of paper with a ":)" written on it. We shall stop the clock as soon as the "(" cannot be seen when looking from above the beaker through the concentration. The temperature shall then be taken down as well as the time taken for it to disappear. * I shall repeat this experiment for my other temperatures only using ice to get my temperatures for 10� and 20�. The whole experiment I then plan to repeat at least once so that I get a wider set of results to compare my investigation with. ...read more.

Conclusion

Evaluation From looking at my results I can tell that my first experiment wasn't as accurate as my repeat experiment. This is because for my repeat I made great care into not mixing apparatus and thoroughly washing out apparatus. Therefore my results should have been better. I think my method was accurate as I kept the experiment in order of temperature and this should have prevented mistakes. Slight alterations could be made to my method which could make it more accurate such as another person could set the stop clock off to make sure that it was started at exactly the same time. Also, we are relying on our eyes to tell us when to stop the experiment because it is when the solution is too cloudy and we cannot se the ":)" anymore. Therefore if we could use an indicator to tell us when to stop the experiment or use another form of checking that the experiment is finished. Overall I think my experiment worked fairly well apart from extreme anomolous results in my first experiment. This however is rectified from my results in the second experiment. Sarah Louise Redmond U5S 07/05/2007 GCSE Chemistry Coursework Investigation 1 of 5 ...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 Patterns of Behaviour 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 Patterns of Behaviour essays

  1. Experiment to Investigate the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate, with ...

    The graph shows this because as the concentration increases, the rate of reaction increases and as the concentration decreases, the rate of reaction decreases. This relationship is shown by the pattern of results and the graphs: on Graph 3 when the concentration was 0.15 Mol.dm-� the rate of reaction is

  2. The aim of this coursework is to investigate the rate of reaction between sodium ...

    In a less concentrated acid, the number of collisions is low, so the rate of the reaction is slower.

  1. Free essay

    Close Your Eyes

    I walked upstairs to my new bedroom. It was the biggest out of the three in the house. Mum thought it would make me happy if I got the largest because she knows I like my space and being a single mum and all she doesn't need much herself.

  2. I aim to investigate the affect of temperature on the rate of reaction between ...

    This is because by this time there is so much heat, which gives the particles of sodium thiosulphate and hydrochloric acid even more energy, allowing them to move around more quickly than before. Obviously, at a higher velocity the particles are going to be more likely to collide.

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