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

Investigate the affect of changing the concentration of Sodium Thiosulphate, on the reaction between Hydrochloric Acid and Sodium Thiosulphate.

Extracts from this document...

Introduction

Rate of reaction Investigate the affect of changing the concentration of Sodium Thiosulphate, on the reaction between Hydrochloric Acid and Sodium Thiosulphate. Variables 1. The concentration of Sodium Thiosulphate 2. The concentration of Hydrochloric Acid 3. Temperature of both solutions 4. Volume of Sodium Thiosulphate 5. Volume of Hydrochloric Acid 6. The depth of each solution in the conical flask 7. The intensity and duration of mixing of the solution The investigation will determine how the concentration of Sodium Thiosulphate will affect the reaction between Hydrochloric Acid and Sodium Thiosulphate. What to change The concentration of Sodium Thiosulphate will be changed during the investigation. What to measure The time taken for a certain amount of precipitate to be produced to obscure a pencilled 'x' will be measured. (The pencilled 'X' will be on a white piece of paper on which the conical flask will stand.) What to keep the same 1. The concentration of Hydrochloric Acid 2. Temperature of both solutions 3. Volume of Sodium Thiosulphate 4. Volume of Hydrochloric Acid 5. The depth of each solution in the conical flask 6. The intensity and duration of mixing of the solution Prediction It is predicted that as the Sodium Thiosulphate is concentrated, the precipitate will be formed faster. ...read more.

Middle

HCl (ml) Conc. Na2S2O3 (ml) H2O (ml) 10 10 0 10 7 3 10 6 4 10 5 5 10 4 6 10 3 7 9. Put the conical flask on top of the white piece of paper with the pencilled 'X'. * The experiment can now be carried out: 10. Put the water into the conical flask, followed by the Hydrochloric Acid, then the Na2S2O3 and start the stopwatch. Mix the solution by 'swirling' the conical flask in a uniform manner for a set number of times or a set duration. Ensure that the flask is set on the marked paper immediately after mixing. A precipitate will begin to form in the flask. 11. Measure the time taken for the precipitate to be produced so that the 'X' can no longer be seen. 12. Record the time taken in a table. (An example of the table is shown below.) HCl (ml) Conc. Na2S2O3 (ml) H2O (ml) 1st exp. (s) 2nd exp. (s) 3rd exp. (s) Ave (s) 10 10 0 10 7 3 10 6 4 10 5 5 10 4 6 10 3 7 13. Repeat the experiment 3 times. 14. Take an average of the time taken and plot a graph of best fit. ...read more.

Conclusion

Thus is it concluded that: The greater the concentration of Sodium Thiosulphate, the faster the reaction with Hydrochloric Acid. Evaluation The experiment was a very reasonable demonstration of the reaction between Sodium Thiosulphate and Hydrochloric acid, and the conclusions are valid. However, there are a number of points that may affect the accuracy of the results and that could be changed in a repetition of the experiment: * A burette could be used instead of a measuring cylinder for the containing the solutions. A burette would enable a more accurate reading to be obtained. * A light intensity instrument could be used to determine the time taken for the 'X' to be obscured. In that way, the subjective assessment by eye would be removed and the results made more accurate. * Whilst the experiment was carried out at room temperature a minor fluctuation may have occurred that could affect the accuracy of the results. Repetition at a known fixed temperature would ensure more accurate results and remove any temperature variables. * Mixing of the solution was carried out by hand simply swirling the conical flask. This may be effective, but it is largely incapable of being consistent and measurable. A magnetic stirrer, allowing only a fixed and consistent mixing operation to take place would allow more accurate results and remove any subjectivity. Jennifer Gowdy 12C 2001 Chemistry Coursework - Rate of Reaction 1 1 ...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 ...

    Using the collision theory I have come to the conclusion that for a reaction to take place two reactant particles must collide with sufficient energy. In order to do this they must have some activation energy, which is the minimum amount of energy that they must collide with in order for the reaction to occur.

  2. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    Sulphur dioxide may trigger and asthmatic attack and people who suffer from asthma should avoid using it. If released, open a few outside windows and let the gas disperse into the outside air. To dispose of sulphur dioxide, use an efficient fume cupboard to vent the gas and make sure

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

    Also measure 10cm� of distilled water in the other 50cm� measuring cylinder. 16. Add the sodium thiosulphate from the measuring cylinder to the conical flask and also the distilled water. Put the thermometer back in to the conical flask.

  2. Investigating the effect of temperature on the reaction between Sodium Thiosulphate (Na2S2O3) and Hydrochloric ...

    Evaluation I think that my experiment was accurately carried out and that the results were firm enough to base a strong conclusion on. The times taken for each experiment seemed to be similar enough, except for room temperature, 20�C. Here the results differed by almost half a minute over the range.

  1. Plan an experiment to investigate the effect of changing the concentration of sodium thiosulphate ...

    On the third stand I will position a light gate that is connected up to a computer. Once I have done this, I will be able to fill a conical flask as accurately as possible with the needed amounts of water and sodium thiosulphate.

  2. To investigate the rate of the reaction between different concentrations of Hydrochloric acid and ...

    However I will rinse each measuring cylinder and make sure it is dry for the next experiment, because if a bit of the substances are left in the cylinders it can add to the rate of reaction and lead to anomalous results.

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

    Meaning collisions between Hydrochloric Acid and Sodium Thiosulfate Solution are more likely to occur. All this can be justified by the full understanding of the collision theory itself: For a reaction to occur particles have to collide with each other.

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

    Add the 50ml of Na2S203 to the conical flask, followed by the 10ml of HCl. 5. When the HCl is added, start the stopwatch. 6. Look down the neck of the conical flask, and when the 'X' is no longer visible, stop the stopwatch.

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