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

How Does Temperature Affect The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid?

Extracts from this document...

Introduction

How Does Temperature Affect The Rate Of Reaction Between Sodium Thiosulphate And Hydrochloric Acid? HCl + Na2S2O3 � NaCl+ SO2 + S + H2O Hydrochloric acid + sodium thiosulphate � sodium chloride + sulphur dioxde + sulphur + water A reaction is a process by which a substance, or substances change to produce a new substance or substances. The rate of reaction is the speed at which products are formed and reactants disappear during a chemical reaction. For a reaction to occur the particles must collide with force, as they need enough energy to break the bonds to form new substances. In this reaction, a fine precipitate of sulphur forms. To measure the rate of reaction, we time how long it takes to form the precipitate. The collision theory says that Chemical reactions occur when particles of the reactants collide. They must collide with a certain minimum energy, called the activation energy. The requirements for a chemical reaction to occur are: the reactants must collide with each other, and the molecules must have sufficient energy to initiate the reaction (called activation energy). Planning: In this reaction the solid sulphur formed makes the colourless solution go cloudy. The reaction is usually carried out in a flask that is placed upon a piece of white paper with a black cross on it. At the beginning of the reaction, the cross can be seen easily. As the flask becomes more and more cloudy, the cross gets harder to see. ...read more.

Middle

This causes them to move around more. Chemical reactions require collisions, and if particles are moving around more quickly they are more likely to collide. At a cold temperature the reaction will take more time to happen. This is because the particles of sodium thiosulphate and hydrochloric acid will not be moving around so quickly, meaning they are less likely to collide; therefore the reaction will take place in more time. This means that my graph with temperature against rate, should have a positive correlation, and will probably be curved as the increase in rate of reaction will not be exactly the same as the temperature is increased. Results: Aimed temperature/ 0C Actual temperature / 0C Time taken for cross to disappear/ seconds Rate of reaction 1/s (rounded to 2dp) 10 12 77 0.01 15 16 64 0.02 20 20 51 0.02 25 26 30 0.03 30 32 22 0.05 35 34 13 0.08 40 39 11 0.09 45 46 10 0.10 50 51 9 0.11 55 53 8 0.13 60 61 6 0.16 65 67 4 0.25 I was able to implement my plan as presented. I have drawn two graphs to illustrate my findings. The first is the temperatures plotted against the time taken in seconds for the cross to vanish, and the second is the temperatures against rate. Both graphs have a curved line of best fit, with only two anomalies showing up. Looking at the above table they do not show up as anomalies, but they are easier to recognise on the graphs, as they sit away from the best-fit line. ...read more.

Conclusion

It is quite difficult to judge properly the exact moment that the cross disappears - the human eye is just not strong enough. It is even more difficult for the higher temperatures as you would have to have an extremely good reaction time to stop the stopwatch exactly when the cross changes. However, my results were consistent even though I did not take multiple results. I only had 2 anomalies, which show up on both graphs. They are not major anomalies, but they sit further from the line of best fit than the other points. The reason for these could be that it was timed wrong. For all of the results, it was very difficult to start the stopwatch exactly at the same the sodium thiosulphate and hydrochloric acid were put together. They would have already started reacting before the stopwatch was started. For further work to the experiment, I could try investigating higher tempratures, although the time taken for the cross to disappear would go down a lot less quickly because it is reaching the boiling point of water, and so the water in the solutions starts to boil and turns to steam. It would be very difficult to get to a higher temperature than 1000C. The decrease of the reaction rate would slow, as it got increasingly difficult for the solution to get hotter. To take it even further I could perform the experiment in a vacuum, as then there would be no other factors that can affect our results, other than temperature, which is all that is wanted as the dependant variable. ...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. How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

    Again a good thing to compare it to is people walking down the street, either quickly or slowly. At the temperature of 41-70°C (again this is including 3 temperature intervals - 41-50°C, 51-60°C and 61-70°C), I predict that the reaction will occur even more quickly than that of 11-40°C.

  2. Free essay

    Close Your Eyes

    Suddenly Carrie burst into tears and we all looked at her. Even Tom took his eyes of the road to turn round and stare at his sister. "Stop arguing!" she cried "My best friend is in hospital and all you can do is argue!

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

    a greater amount of energy, which will increase the speed they travel at. The greater the speed of the molecule the more violently it will react when it comes into contact with other molecules and also the frequency of collisions will be far greater.

  2. How will the temperature affect the rate of reaction with sodium thiosulphite and ntric ...

    particles will also increase; * Concentration, because if the solution is made more concentrated, it means that there are more particles in a certain area, which therefore means that the collisions between each type of particle will become more likely; * Adding a catalyst, because a catalyst works by giving

  1. How does the Temperature affect the Rate of the Reaction between Sodium Thiosulphate and ...

    * Remove beaker from over the flame * Place the beaker over the printed ink cross * Position yourself directly above the beaker so that the ink cross is fully visible through the solution * Pour the 5cm2 of acid into the solution and simultaneously start the stopwatch * Keep

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

    A basic rule followed by most chemists is that for every 10 Kelvin's the temperature is raised through the rate of reaction is doubled therefore for each 1 Kelvin raised the rate of reaction increases by about 10 percent. However experiments using the kinetic theory show however that the increase

  1. How does temperature affect the rate of a chemical reaction?

    A catalyst works by lowering the activation energy. This provides an alternative route for the reaction to take which requires lower activation energy than a normal route. 5. Pressure (in gases) - The speed of the reaction increases when the pressure is increased.

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

    studentcentral.co.uk At 0-10�C, I predict that the reaction will take a very long time to react. The reason I say this is because although the particles will be moving around, they will not be moving at a high enough velocity.

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