• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9
  10. 10
  11. 11
  12. 12
  13. 13
  14. 14

Investigating the Reaction Between Sodium Thiosulphate and Hydrochloric Acid

Extracts from this document...


Investigating the Reaction Between Sodium Thiosulphate and Hydrochloric Acid P O A E Name: Group: Teacher: Candidate Number: Centre Number: References In order to understand the experiment better, and to get more accurate results, I used the following sources for extra information: * Science to 16- Pople and Williams, Page 19 * GCSE Chemistry- Earl and Wilford, Chapter 11 * www.schoolchem.com/rc4.htm Planning 1) Research a) Measuring the Rate of Reactions The rate of reactions can be measured by either tracing the lessening of the reactant, or the development of a product. b) What is the collision theory? A reaction can only happen between particles when they collide. Particles have to collide with enough force in order for a reaction to be possible, as if they do not collide with enough power, the particles merely rebound off each other, and so no reaction can take place. Particles have more energy the faster they are moving, and therefore the collision rate increases. Particles move faster when the temperature is increased. c) How can we change the rate of a chemical reaction? There are five ways to increase the reaction rate. These are: 1) Increasing the temperature 2) Increasing the concentration 4) Increasing the surface area of a solid (e.g. a powder has a larger surface area than a block) 5) Use a catalyst. The reaction rate can be decreased by: 1) Decreasing the temperature 2) Decreasing the concentration 4) Decreasing the surface area of a solid (e.g. a block has a smaller surface area than a powder) 5) Not using a catalyst. d) What is a 'catalyst'? ...read more.


- Repeat the experiment for various volumes. oOOOO 3) Diagrams 4) Predictions I predict that the rate of reaction will increase as the volume of sodium thiosulphate is increased. However, I think that as the volume of sodium thiosulphate is decreased, the reaction rate will also decrease. I think this because it is the sodium thiosulphate which makes the solution become opaque, and therefore the more of this substance is included, the faster the solution should go cloudy. When the amount of hydrochloric acid exceeds the amount of sodium thiosulphate, the sodium thiosulphate will be unable to work as quickly, as it will take longer for the hydrochloric acid particles to combine with a sodium thiosulphate particle. 5) Fair Testing - Only one variable should be changed per experiment - The same conditions should be kept, where possible, throughout experimentation e.g. heat (if the variable being altered is not temperature), light etc - Keep the intervals between the amounts of each chemical different i.e. change the amount of each by 5cm3 or 10cm3 each time - Do not mix the sodium thiosulphate and hydrochloric acid together until there is the required amount of each substance, and the required conditions have been met - Start the stopwatch at the same point in each experiment - The same person should watch the cross each time (if the experiment is to be conducted in groups) 6) Safety Rules - Goggles must be worn at all times - Long hair must be tied back - All stools and chairs must be pushed under desks or out of the way - All coats and bags should be put away properly and out of the way - No running in ...read more.


Explain how the evidence collected is good enough to make an accurate conclusion? The results achieved were as fair as possible, and as human error was greatly reduced, quite reliable. Only one variable was altered for each experiment, and this was changed in equal amounts. The stop watch was stopped the second tat the cross was no longer visible, and so in precisely the same point on each test. The substances were, obviously, not mixed prior to the experiment, and so worked to their maximum potential. Describe, in detail, further work that you could do to provide additional evidence? In order to provide more evidence, I could perform the experiment manually. This way, I would have slightly more options open to me, as there were limited choices on the computer. For example, if I performed the experiment manually, I would have the opportunity to lower the temperature using ice, or heat it up to 100�c to get a wider range of results. I would also be able to experiment with different volumes of sodium thiosulphate more freely. I could also experiment with altering different variables, such as different concentrations of hydrochloric acid, in order to see what would happen to the reaction time. Also, I could perform other experiments to see how reaction rates change. I could do the other two experiments discovered in my research: the reaction between calcium carbonate and dilute hydrochloric acid, and the disintegration of hydrogen peroxide solution. This would tell me if the patterns for rates of reactions remain the same for all experiments, rather than just one, or what the differences between the rates of reactions are, nd why they are different. Page 1 of 14 ...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. Chemistry-Sodium Thiosulphate

    1 large measuring cylinder * 2 small measuring cylinders * 1 beaker * Sodium thiosulphate * Hydrochloric acid * Distilled water * Pipet * Card with 'X' on * Stop watch Method: 1. Measure required amount of sodium thiosulphate using large measuring cylinder.

  2. An Experiment to Investigate the Effect of Changing the Concentration of Hydrochloric Acid on ...

    Concentration of Sodium Thiosulphate: Sodium thiosulphate = 158g Na2S2O3 (46 + 64 +48= 158) One mole of sodium thiosulphate is 158g of sodium thiosulphate. One molar solution of sodium thiosulphate would contain 158g of sodium thiosulphate dissolved in 1dm� of water (the solvent).

  1. Investigation a Chemical Reaction between Sodium Thiosulphate and Hydrochloric Acid

    Firstly I investigated how a change in the Sodium Thiosulphate would affect the time taken for the water to go cloudy. The method, which I used, was to firstly collect all the apparatus. This included; a beaker, paper marked with a cross, stopwatch, 50cm3 measuring cylinder, 10cm3 measuring cylinder, water, Sodium Thiosulphate and Hydrochloric Acid.

  2. Sodium Thiosulphate and Hydrochloric Acid Experiment

    thing being changed and therefore the only thing that can affect it. All other variables have been located and controlled. For accuracy I will be using burettes to measure the reactants out, which should ensure that the amounts remain the same.

  1. Investigate how the rate of the reaction between Sodium Thiosulphate and Hydrochloric acid can ...

    Place the beaker on to the cross making sure the cross is in the centre of the beaker Pour the two chemicals into the beaker and using the thermometer check the temperature of them. As you pour the chemicals into the beaker start the stopwatch Look down from a bird's

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

    I think my experiment would have been much better and more precise if I had used the same hydrochloric acid and sodium thiosulphate from the same bottle. This is an experimental error because the concentration of the hydrochloric acid and the sodium thiosulphate may have been slightly different, in the

  1. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    I will then conduct four further experiments using 0.4, 0.3, 0.2, and 0.1 moles of hydrochloric acid, whilst still using 25cm3 of sodium thiosulphate each time. The ratios of sodium thiosulphate, hydrochloric acid, and water that I'm going to use are as follows: Volume of Na2S2O3 Volume of HCl Volume

  2. Sodium thiosulphate and hydrochloric acid Investigating how the rate of reaction is affected ...

    the numbers of successful collisions with enough energy to break existing bonds and make product parties. The minimum energy needed for a successful collision is called the activation energy. For a reaction to take place reagent molecules must collide with each other.

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