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

Investigate how changing the concentration of Sodium Thiosulphate affects the rate of reaction with Hydrochloric Acid.

Extracts from this document...


Aim: I am going to investigate how changing the concentration of Sodium Thiosulphate affects the rate of reaction with Hydrochloric Acid. I am going to time how many seconds/minutes it takes until you can no longer see the black cross on a piece of paper under the beaker. Each time I do the experiment, I will change the amount of thiosulphate and water in the reaction mixture. I want to find out if the concentrated thiosulphate makes the reaction go quicker. Background Information For a chemical reaction to take place, the particles have to collide with enough energy for something to change. There are five factors that will affect the rate of reaction that we need to take into consideration, these are: * Temperature - I will conduct all the tests at room temperature (hopefully on the same day) because temperature has an effect on the rate of the reaction. * Concentration - I will try my best to use all the acid from the same bottle, which then makes it more of a fair test as all the acid should be the same concentration. * Surface Area - This will not affect any of my results, as we are not using any solids in the investigation. * Catalyst - This speeds up reactions. ...read more.


the timing, otherwise there may be extra seconds added on to the final time of the experiment which would then not even be worth keeping and would have to be repeated. The reason I am repeating this test 3 times, is to get the most accurate results I can. The more results the better I can judge what good results to work on are and what are irregular results. Also by doing this test 3 times I can get better at doing the test and improve as I go on. Results: Test 1 How much sodium thiosulphate? Time taken for the X to disappear 4 ml Sodium Thiosulphate 6.12 min 8 ml Sodium Thiosulphate 5.43 min 12 ml Sodium Thiosulphate 3.02 min 16 ml Sodium Thiosulphate 2.29 min 20 ml Sodium Thiosulphate 1.34 min It is hard to see any irregular results in this but I think that it took too long to disappear fully. This could be because the person stopping the clock and not doing it exactly on time, or it could be down to something more scientific. I would need to do more tests to check this. Test 2 How much sodium thiosulphate? Time taken for the X to disappear 4 ml Sodium Thiosulphate 9.37 min 8 ml Sodium Thiosulphate 6.15 min 12 ml Sodium Thiosulphate 4.24 min 16 ml Sodium Thiosulphate 1.49 min 20 ml Sodium Thiosulphate 1.25 min ...read more.


If The Gilberd had this kind of equipment then I think it would have been a much more accurate investigation. I think that because my results have a certain amount of inconsistency between them it would be a good idea to repeat them again if I had time Are my results accurate? My results are good in their accuracy. Although, I did get some irregular results but I was expecting that. All my 'good' results fitted my prediction. I tested my results three times to make sure that I did not make any mistakes. Are they reliable? I feel that my results are accurate apart from the 'odd' one. I see them as reliable but if my views then my results are not reliable. I think I would need to look at this investigation more to make my mind up to whether they are or not. Other things that may have affected the accuracy of the experiment could include, the distance of the persons eyes away from the conical flask and the X underneath. Also before we done the test, we could of tested to see who has the best eye vision, which would therefore help a lot. To extend this work one could look into the affects of catalysts (and other variables) on reaction times or you could try the same experiment with different substances or by varying the amount of acid instead. David Mateer ...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. Marked by a teacher

    Chemistry Coursework - How the concentration effects the rate of reaction between sodium thiosulphate ...

    This is due to the amount of successful collisions that occurred while the higher concentrated solution was being observed and while the lower concentrated experiment was investigated I could come to the conclusion that less collisions were taking place and less of a successful reaction was occurring.

  2. Free essay

    Investigating the Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid

    It is important to make sure all equipment is clean and does not have any other chemical or substance inside that could effect the reaction. It will also be important to keep a steady temperature during the experiment. This is not a huge worry as the temperature will always be room temperature throughout the experiment.

  1. How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

    This means that they cover more ground and are therefore more likely to hit each other, or have a collision, which in turn makes the reaction faster. This is because when the temperature increases so does the average energy of particles, therefore the number of particles which have the activation energy increases.

  2. Free essay

    Close Your Eyes

    So I forced myself out of the car and through the gates. *Carrie* The first time I saw her was as I was heading to Maths. Books clutched to her chest she had chestnut brown hair tied back in a tight ponytail and big brown eyes.

  1. Measuring the reaction rate of sodium thiosulphate in hydrochloric acid

    The chemical reaction between sodium thiosulfate and hydrochloric acid is mildly exothermic. Figure 3: 2.4 Factors Increasing the concentration of the reactants and raising the temperature bring about more collisions and therefore more successful collisions, increasing the rate of reaction.

  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. Investigation on the Effect of Temperature on the Rate of Reaction between Sodium Thiosulphate ...

    shown as: Sodium Thiosulphate + Hydrochloric Acid --> Sodium Chloride + Sulphur Dioxide + Suplhur + Water Na2S2O3 (l) + 2HCl (l) --> 2NaCl (aq) + SO2 (g) + S (s) + H2O (l) In this reaction, both the sodium thiosulphate and hydrochloric acid are clear.

  2. Rates of reaction of Sodium Thiosulphate with Hydrochloric Acid

    Smaller size of solid particles of a reactant will increase the surface area, which means that particles will have a larger area to work on and there will be more useful collisions. 4) The presence of a catalyst is used to increase the number of collisions.

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