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

How different variables will affect the rate of a reaction between Sodium Thiosulphate and Hydrochloric acid.

Extracts from this document...

Introduction

INTRODUCTION: I am going to be investigating how different variable will affect the rate of a reaction between Sodium Thiosulphate and Hydrochloric acid. Sodium Thiosulphate + Hydrochloric acid Sodium Chloride + Sulphur dioxide + Sulphur + Water Na2S2O3 + 2HCl 2NaCl + SO2 + S + H2O Sodium Thiosulphate and Hydrochloric acid are both colourless solutions but when they are mixed together they become cloudy and eventually opaque. We can obviously not measure rate directly, but what we can measure is the time taken for a change to occur. Rate = Change/Time I will take the time by placing the beaker containing the Thiosulphate on a piece of paper with a cross on it. I would start the timing as soon as I added the Hydrochloric acid to the solution and I would stop as soon as I could see the cross no longer. For a reaction to take place two substances must collide. The rate of reaction depends on how many collisions occur in a given space for a given length of time. I will be measuring collisions/cm3/second. However not all collisions lead to a reaction because in order to react existing bonds must be broken - this needs energy, in a collision the kinetic energy of colliding particles might not be enough to break bonds. ...read more.

Middle

(ml) Time Taken (Minutes: Seconds) 0: 50 0:20 5: 45 0:24 10: 40 0:30 15: 35 0:29 20: 30 0:36 25: 25 0:56 30: 20 1:00 35: 15 1:40 40: 10 2:52 45: 5 6:20 50: 0 No Reaction From these results I can tell that having over 40 ml of water to 10ml of Sodium Thiosulphate is too much because it takes over five minutes to react and that is too long. So I have decided to only dilute the Thiosulphate to a ratio of 40:10 ml. I have also learnt that I should not include the results, which are under a minute. This is because my timing is far too inaccurate and any results under a minute are too close together. You can see this from my preliminary results where the timings go from 0:30 to 0:29 and then back up to 0:36 when it should continue to rise in a curve. I have decided to take the readings from 25:25 to 43:07, (Water : Sodium Thiosulphate) which is 8 readings. I have chosen to go no higher than 45:05 because of the reasons I explained earlier. It does not matter too much if my results are a bit under a minute because as long as it is over 40 seconds it should still be reliable. ...read more.

Conclusion

the same. My graphs look accurate if you look at them as an exponential curve but the end is still a bit erratic. If you look at the graphs there are no obviously anomalous results I can tell this because they are all in a close proximity to the line of best fit. The experiment was fairly easy to perform because the most difficult part was measuring out the amounts of the liquids accurately. I think I did this quite well however because if I had done it badly there would be a lot of anomalous results. I do not feel fully sure that my evidence is fully reliable because I think that I should have taken more results and I should have taken more time in planning my experiment and doing it with more care. Whereas what I actually did was to rush all of the planning and I was then forced to rush the experiment. I could improve it by using a wider range of concentrations, which would lead to a more accurate line of best fit. I would also have done each reading more than once and taken an average, which would have increased the accuracy. Possible problems with my coursework could have been the caused by human error. There could have been error in stopping the stopwatch, although this would have been minimal. ...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 minimum amount of energy that they must collide with in order for the reaction to occur. The more successful collisions there are the quicker the reaction will be. The particles also have to collide with the "correct orientation and must fit together, this is called the 'lock and key theory" (science website).

  2. How does the concentration of sodium thiosulphate solution affect the rate of its reaction ...

    The line of best fit is identical. But my time graph is slightly different. Although the lines of best fit have the same negative correlation. I drew a straight line of best fit on my predicted graph and my actual graph has a curved line of best fit.

  1. Free essay

    Close Your Eyes

    He walked out the door and downstairs in nothing but his boxers and I stood in his room for a minute before gathering my clothes and heading out. I still had no idea where my underwear was but I couldn't be bothered to look.

  2. How does the Temperature affect the Rate of Reaction between Sodium Thiosulphate and Acid?

    After the temperature reached our target it was then taken off the tripod and put onto our piece of paper which had a cross marked on it. 5) 5cm3 of hydrochloric acid was then added to our solution of sodium thiosulphate and water and the stopwatch was immediately started.

  1. How does the Temperature affect the rate of the reaction between Sodium Thiosulphate and ...

    Pour the sodium disulphate into the same beaker as the distilled water. 3. Heat the solution to 30 degrees Celsius using a Bunsen burner Place a pertri dish on top of the beaker to stop the solution evaporating out of the beaker.

  2. Investigating how mixing sodium thiosulphate with HCL will react and what variables affect the ...

    Another problem we faced was spilling the thiosulphate when putting it in the solution because we were trying to get it in fast, my solution to this problem is to very quickly empty the thiosulphate in rather then pouring it in just put the test tube with the thiosulphate upside

  1. Find out how the rate of hydrolysis of an organic halogen compound depends on ...

    Figure 14 Temperature Temperature has an important effect on the rate of chemical reactions and we make use of it constantly in our everyday lives, for instance the chemical industry depends heavily on it and there would be no Haber process for making ammonia without it.

  2. How Does The Concentration Of Sodium Thiosulfate Affect The Rate Of This Reaction?

    must be poured into the conical flask simultaneously. This ensures a fair test; one more thing is that the stop-clock must be started as soon as the two solutes mix together. Another factor which can affect my results is the conical flask. I must wash it out with water and dry it each time.

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