• 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 ...

    flask as the solution starts of clear and then forms a yellow precipitate. After this part of the experiment is over I will empty the conical flask and thoroughly wash it because it could cause some experimental error later on.

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

    and during the reactions are taking place as in the preliminary experiment I only took it before the precipitate formed. As a result I could not tell whether the reaction that occurred was exothermic or endothermic. OBTAINING EVIDENCE Method: 1.

  1. Effect Of Concentration On The Rate Of Reaction between Sodium Thiosulphate & Hydrochloric Acid.

    The results are mainly good, and this could mean that the experiment was done perfectly. Although all the average times and rates of reaction conform to a pattern, they are not all evenly spaced, and are therefore probably not perfect.

  2. How Concentration affects the rate of reaction.

    + 2HCl(aq) -> 2NaCl(aq) + S(s) + H2O(l) + SO2(g) Water was also produced in the reaction even though I could not tell it was produced. I also found out that the rate of which the Sulphur was produced varied due to the concentration of the sodium thiosulphate.

  1. Investigating the rate of reaction between sodium thiosulphate and hydrochloric acid

    Therefore it is important to record the temperature as it may differ with the outside weather, and this difference could potentially drastically alter the time the reactants take to react. I am also planning to use burettes and a small measuring cylinder (for the hydrochloric acid)

  2. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    Chemical reactions take place when reacting particles collide with an amount of energy greater than or equal to the activation energy. The next diagram shows what the activation energy of a reaction looks like when represented on a graph. As you can see, the graph goes up before it starts to come down.

  1. Experiment to investigate how changing the concentration of hydrochloric acid affects the rate of ...

    * Afterwards, I will repeat all of the above for every different concentration of hydrochloric acid that I will use; which is 1M, 1.5M, 2M, 2.5M and 3M. For each concentration I need to do the experiment three times. From the three set of results for each concentration I will

  2. Effects of Concentration of Sodium Thiosulphate in the reaction of Hydrochloric Acid and Sodium ...

    Repeat the entire experiment a second time. 16. Find the average time it takes for the 'X' to be obscured in each case by adding the two times and dividing by two. Rate is calculated by finding the inverse of this time.

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