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

Investigating rates of Reaction

Extracts from this document...

Introduction

Investigating rates of Reaction Aim The aim is to investigate the effect of changing the concentration of sodium thiosulate on the rate of the reaction between sodium thiosulphate and hydrochloric acid. Prediction I think that increasing the concentration will increase the rate of reaction. This is because in order for a chemical reaction to occur particles must collide with sufficient energy to react. This is the activation energy. If the particles do not have enough energy when they collide, they simply bounce off each other. If two particles move towards each other without the sufficient energy... ...when they collide, they will not react... ...they will simply bounce off one another, and remain un-reacted. Two particles with enough energy however... ...will collide... ...and react. In a solution, all of the particles will have different energy levels, only the particles with enough energy (more than the activation energy) will react. On the graph, the Activation energy is the black dotted line, so only the particles with more than this (those in the shaded area) will react. As most of the particles so not have the amount of energy needed to react, the rate of reaction will be quite slow as the chances of these particles colliding are low. ...read more.

Middle

Then I will ad 10ml of HCl and start the timer. When the X cannot be seen, i.e. when they have reacted, I will stop the timer and make a note of the result. I will then repeat this experiment with the other four sets of measurements. Results Reactants (50ml of Na2S2O3 and...) Time to fully react (secs) 50ml of Na2S2O3 35.9 40ml of Na2S2O3 and 10ml of water 43.62 30ml of Na2S2O3 and 20ml of water 64.84 20ml of Na2S2O3 and 30ml of water 75.52 10ml of Na2S2O3 and 40ml of water 235.66 Then I repeated the experiment twice more to make sure my results were accurate. Reactants (50ml of Na2S2O3 and...) Time to fully react (secs) 50ml of Na2S2O3 34.11 40ml of Na2S2O3 and 10ml of water 44.81 30ml of Na2S2O3 and 20ml of water 64.24 20ml of Na2S2O3 and 30ml of water 104.05 10ml of Na2S2O3 and 40ml of water 202.64 Reactants (50ml of Na2S2O3 and...) Time to fully react (secs) 50ml of Na2S2O3 36.35 40ml of Na2S2O3 and 10ml of water 41.92 30ml of Na2S2O3 and 20ml of water 63.59 20ml of Na2S2O3 and 30ml of water 98.59 10ml of Na2S2O3 and 40ml of water 235.57 The highlighted results are anomalies and have been left out my averages to make them accurate. ...read more.

Conclusion

I had some anomalies in my results; in my first experiment 20ml of Na2S2O3 gave me 75.52 secs, and in my second experiment 10ml of Na2S2O3 gave me 202.64 secs. These anomalies are identified on my result graph. These anomalies could have occurred for numerous reasons; I could have made a mistake when measuring out the reactants, or taken my eye off the x and not realised the reaction was complete. This suggests that the quality of my results was not good enough to support my conclusion, however I carried out the experiment three times so that any anomalies in one of the three could be left out of my final average results and they would be more accurate. The procedure carried out gave me results that were in line with my prediction, so it would seem to be a reliable process. It could be improved, however, by using a bulb and light sensor to automatically produce a graph of results, this would mean that the only possibility of error would be when measuring the reactants. This could have it's disadvantages as the bulb would be close to the reaction, so could effect the temperature of the reactants, therefore increasing the rate of the reaction, so it would be a fair test. I could further investigate the rate of reactions by doing an experiment to see how temperature or volume of reactants affects the rate of reaction. ...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. Investigating the effect of temperature on the reaction between Sodium Thiosulphate (Na2S2O3) and Hydrochloric ...

    This theory is as follows: The rate of a reaction depends on how often the reacting particles collide with each other. They must collide in order to react. An increase in temperature increases the number of collisions. Temperature gives energy to the particles.

  2. An investigation into a factor affecting the rate of reaction of sodium thiosulphate (Na2S2O3) ...

    The "X" card I used was the same each time, as different pieces could have a darker mark on than others. I performed the experiment on each concentration three times, in order that I could average my results and thereby increase accuracy and reduce anomalous readings.

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