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

Factors affecting the rate of reaction of Hydrochloric acid with sodium thiosulphate

Extracts from this document...

Introduction

Rate of Reaction investigation: Factors affecting the rate of reaction of Hydrochloric acid with sodium thiosulphate When hydrochloric acid and sodium thiosulphate react, they form sulphur, sulphur dioxide and water as products. This can be expressed in the equation: Hydrochloric + Sodium -> Sodium + Sulphur + Sulphur + Water Acid Thiosulphate Chloride Dioxide HCl (aq) + Na S O (aq) -> NaCl (aq)+ S (s) + SO (g) + H O (l) In this experiment, I will investigate how changing the concentration of one of the reactants affects the rate of the reaction. Prediction I predict that as the concentration of the sodium thiosulphate becomes more diluted the rate of reaction will become slower as there is less sodium thiosulphate and more water in the beaker for the acid to react with. This will take the reaction longer to take place and so the rate of reaction decreases. This can be explained more clearly by relating to the collision theory. If solutions of reacting particles are made more concentrated there are more particles per unit volume, so therefore collisions between reacting particles are more likely to occur. ...read more.

Middle

I waited for the visibility of the black cross to be completely obscured by the mixture, stopping the clock when this happened. I then recorded the time and washed out the conical flask before starting the next experiment. Analysis My results tables and graphs display my findings from this experiment. he first graph plots time taken for the reaction to take place against the concentration of sodium thiosulphate. It has negative correlation, as the time taken for the reaction to take place increases as the concentration becomes more diluted. The highest concentration completes the reaction in 30 seconds, whereas the lowest concentration, 0.1 mols sodium thiosulphate, takes around 600 seconds to complete. The lowest concentration takes around 20 times longer to react than the highest concentration. The line of best fit is a curve because the decrease in time is not proportional as the concentration is diluted. Graph 2 for experiment 2 shows a similar pattern to the graph for experiment 1. Point 0.6 appears to be anomalous, which is most likely to be due to errors in the timing of the experiment. The rate of reaction increases more or less in proportion to the concentration. ...read more.

Conclusion

to assume that after a thorough washing out, the glass would be clean and would not contaminate my next experiment, but this still could have occurred. The only thing I can suggest to improve this fault would be to use a fresh, clean conical glass for each experiment, but by using different equipment this may also cause an inaccuracy in my findings. The use of a pH meter to monitor the pH of the solution as it is reacting may have helped my experiment by enabling me to see the reaction take place more clearly. To provide more evidence for my investigation I could use a thermometer to measure the temperature of the solution during the experiment to see if any heat is given off and how this may affect the experiment. For further investigation, I could use stronger sodium thiosulphate to see if there is a limit to how quickly the reaction can take place. Overall, my results and graphs clearly show the relationship between the effect of concentration upon the rate of reaction, so I do not think that the faults in my method have caused any major problems, however, with the suggested improvements I could achieve more accurate and reliable results to support my conclusion further. ...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. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    of H2O Total volume 25 25 0 50 25 20 5 50 25 15 10 50 25 10 15 50 25 5 20 50 I plan to time how long it takes before the light is no longer visible through the solution.

  2. How does the concentration of sodium thiosulphate solution affect the rate of its reaction ...

    It was very difficult to tell when the cross was completely gone and the reactants completely opaque which could explain my anomalous results. A more accurate and precise way of measuring when the reaction had finished could be using a light sensor connected to a computer underneath the conical flask

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

    We agreed that we wanted a larger amount that would result in quicker reactions because we were very limited by the amount of time we had. Using 40ml of each chemical would have been ideal, but the school did not have that much available for everyone, so we decided to use 30ml of each instead.

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

    Key factors: The key factors, which can be changed or controlled to aid my experiment, are: TEMPERATURE: if the temperature is increased, the particles of Sodium Thiosulphate move more quickly, therefore, there is a larger chance of a collision-taking place.

  1. Factors Affecting Enzyme Activity

    Unfortunately I only had time to investigate one of these factors (concentration of enzyme). To further my investigations I would move n to investigate the affects of temperature on enzyme activity. In my plan I described how and why I thought temperature would affect enzyme activity.

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

    Apparatus: * 8g/Litre Sodium thiosulphate solution (0.15 mol.dm-�) * 2M Hydrochloric acid (dilute) * Distilled water * Stopwatch (accuracy to 100th of a second) * Thermometer (0-110�C), measures in 1�C units. * White paper/card with a large black cross (X)

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

    These are the five different concentrations that I will use for my experiment: 1M, 1.5M, 2M, 2.5M, 3M The reason why I couldn't use a wider range of concentrations is because we are not allowed to use hydrochloric acid that is above 3M.

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

    Therefore they are inversely proportional. Interpreting Results Concentration of Na2S203 in solution (mol dm-3) Rate 1/t (s-1) 0.133 0.0328 0.107 0.0256 0.08 0.0179 0.0533 0.0106 0.0267 0.00398 As the concentration decreases the rate decreases also, showing that they are proportional to each other.

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