• 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

This experiment's title is: "investigate how the concentration of Sodium Thiosulphate affects the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid".

Extracts from this document...


GCSE Chemistry Coursework 1. Title of Investigation This experiment's title is: "investigate how the concentration of Sodium Thiosulphate affects the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid". 2. Background to Investigation * Whilst performing an experiment where some Sodium Thiosulphate (Na2S203) and Hydrochloric Acid (HCl) were mixed together, it was noticed that, they reacted together to form a cloudy solution. * Hence, we decided to investigate how the concentration of the Sodium Thiosulphate affects the rate of the reaction between Sodium Thiosulphate and Hydrochloric Acid. - When the two chemicals are combined the mixture gradually turning cloudy will make the "x" disappear. 3. Planning 3.1 Safety Whilst performing this experiment there are a number of safety procedures which must be adhered to: * Safety goggles must be worn, as Hydrochloric acid is extremely corrosive. * All schoolbags etc. should be out of the way, so nobody trips over them. * Blazers should be removed and ties tucked in. * Any spillages, should be reported to the teacher. 3.2 Variables There are many different variables which I must be aware of throughout this experiment: 3.2.1 Independent Variable This will be the concentration of the Sodium Thiosulphate and will be changed throughout the experiment. ...read more.


(cm3) (cm3) (cm3) 5 3.125 48.875 10 10 6.250 43.750 10 20 12.500 37.500 10 40 25.000 25.000 10 80 50.000 0.000 10 * In order to make the Sodium Thiosulphate more dilute measured amounts of water will be added to it (the amounts are shown in the table above) before the HCl is added. * For smaller volumes of Sodium Thiosulphate, we will double the amount measured out. So, instead of 50cm3 of Sodium Thiosulphate and water solution being measured, 100cm3 will be measured out. This is so that we can measure the Sodium Thiosulphate accurately. 3.5.2 Repeat Readings * To ensure fair and accurate results, I will take two separate readings for each concentration of Sodium Thiosulphate, an average will then be calculated and placed in the final result table.. * If the two readings vary by a substantial amount of time (possibly due to human error) . I will take a third reading and discard the most inaccurate result. 3.5.3 Processing Results * The table into which I will place my results is shown below: Concentration Of Na2S2O3 (g/dm3) ...read more.


This meant that the measurements were not entirely accurate, hence the final results were not as accurate as they could have been. In order to improve this, we could have used more sophisticated apparatus to measure the volumes and to time how long the " x" takes to disappear. For example: a syringe, or other more accurate apparatus to measure the smaller volumes. * We could also have chosen an easier dependent variable to measure. This is because it was nearly impossible to determine exactly when the "x" disappeared using the human eye. Either this or a more sophisticated system of determining when the "x" disappeared such as a camcorder fitted to a pc could have been used. 4.6.2 Execution of Experimental Procedure * In my opinion, I feel that under the circumstances and restraints of the simple equipment used the experiment was preformed extremely well. Using a larger volume of the solution than required as we did made it far easier to measure out the smaller volumes of Sodium Thiosulphate therefore enabling us to obtain more accurate results. Overall, as there was only one major anomaly over both of the graphs I feel that our experiment was a success. ...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 ...

    Once this is done I will repeat the same idea but instead of having 50cm� of sodium thiosulphate I will have 40cm� and 10cm� of distilled water. This is how I am changing the concentration to find out the rate of reaction.

  2. Free essay

    Investigating the Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid

    Apart from that one result, my experiment has been mainly accurate. Although, there are a number of ways we could've made our results more reliable and accurate. For example, we could've tried to swap around and use the hydrochloric acid as the variable substance and use the Sodium thiosulphate as a constant and see how the results would differ.

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

    * White paper/card with a large black cross (X) drawn on it * Felt tip pen * 250cm� conical flask * 10cm� measuring cylinder * 50cm� measuring cylinder X 2 * 250cm� beaker X 2 * 100cm� beaker Preliminary Experiment: Before the actual experiment was conducted I carried out a preliminary experiment, which is in others words, a trial run.

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

    If we take the collision theory into account, we know that when there are more particles in a reaction, there are likely to be more collisions, which results in a greater rate of reaction. In this investigation, by increasing the concentration of sodium thiosulphate, we in fact increased the number of particles in the solution.

  1. How Concentration affects the rate of reaction.

    But if there are more sodium thiosulphate particles in the same volume of solution for the hydrochloric acid particles to collide with, then there will be more chances of effective collisions that result in a reaction and the making of new products.

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

    However, our results clearly showed that the temperature experiment produced a greater spread of data across a range of temperatures (see graph 2), demonstrating collision theory. Meanwhile, the concentration experiment had a very small spread of data across a range of concentrations (see graph 1), showing that although concentration is

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

    As in my aim: I had already decided that I wanted to obtain the minimum of five readings so I could draw up at least some conclusions. Otherwise the investigation would be pointless because my analysis and evaluation would be based on my own assumptions.

  2. An investigation into the effect of Concentration of Sodium Thiosulphate on the rate of ...

    lower the concentration of water molecules, so therefore, there is a larger chance of a collision between Sodium Thiosulphate particles, and those of Hydrochloric acid. In a reaction where one or both reactants are in high concentrations, there are more particles, closer together, so therefore they are more likely to collide.

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