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

Investigating a Factor affecting the rate of reaction between Sodium Thiosulphate and dilute Hydrochloric acid

Extracts from this document...

Introduction

Investigating a Factor affecting the rate of reaction between Sodium Thiosulphate and dilute Hydrochloric acid Planning We have been asked to investigate the rates of a reaction and the effect different changes have on it. The rate of a reaction can be described as the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. This rate is calculated by dividing 1 by the time taken for the reaction to occur. The reaction I have been asked to investigate is: Sodium Thiosulphate + Hydrochloric Acid ? Sodium Chloride + Water + Sulphur Dioxide + Sulphur Na2 S3 O2 (aq) + 2HCl (aq) ? 2NaCl (aq) + H2O (l) + SO2 (aq) + S(s) The dilute Hydrochloric acid reacts with the Sodium Thiosulphate solution to give a precipitate of sulphur. Both liquids are clear and colourless before they react. The appearance of the insoluble sulphur during the reaction makes the mixture cloudy. The cloudiness increases as the reaction is allowed to proceed. According to the collision theory of reacting particles, there are five factors that affect the rate of a reaction: * Concentration (of solution) * Temperature * Pressure (in gases) ...read more.

Middle

I can do this by either swirling it a set number of times or not swirling it at all. I have decided to do the latter of the two, which will be easier and because if I swirled the flask a set number of times, there would be a possibility of swirling it with different forces. The stopwatch I used measured only to seconds and not any decimal places, which means that the results were not accurate enough. For my actual experiment I will use a stopwatch which measures to two decimal places. Volume of Sodium Thiosulphate (ml) Volume of Water (ml) Concentration of Solution (mol/dm3) Time taken for reaction to occur (s) Average time (s) Rate of Reaction 1 2 50 0 0.15 31.31 33.57 32.44 0.031 40 10 0.12 38.84 40.59 39.72 0.025 30 20 0.09 57.05 57.71 57.38 0.017 20 30 0.06 78.40 81.56 79.98 0.013 10 40 0.03 164.61 148.81 156.71 0.006 0 50 0.00 No reaction No reaction No reaction No reaction Results To improve the reliability of my results, we used the same person to look at the cross through the solution and decide when they could not see the cross anymore. If we hadn't done this the experiment would not have been a fair test because my partner and I have very different eye sight. ...read more.

Conclusion

If I did the experiment again I would repeat the experiment one more time to improve the reliability. I don't think the way we measured when the experiment had stopped was very accurate because it was very hard to tell when the cross was impossible to see anymore. So, if I was to do the experiment again I would choose a reaction which results in bubbling, so that it would be easier to tell when the experiment has come to a halt. My results are reliable as well because when I took the repeats of each concentration, they did not vary much. All of my results are consistent with each other and no results were so different that they should have been ignored. However, I could have repeated the experiment again, but I doubt that they would have changed the average very much unless they were particularly anomalous. To extend my enquiry I could investigate the rate of a different reaction using solid and a liquid instead of two liquids. This would also give me a chance to change the surface area of the solid reactant, which I could not do in this experiment. I could then look at the graphs that my results will have given me to see if they show the same trends as in this experiment. ...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. Sodium thiosulphate and hydrochloric acid Investigating how the rate of reaction is affected ...

    Method: 1. Put safety goggles on. 2. Get all the equipment ready 3. Pour out hydrochloric acid and sodium thiosulphate in separate beakers 4. check the stop clock is functioning well 5. Assign each member of the group with a job 6.

  2. Investigating Factors Affecting the Rate of a Chemical Reaction

    Record the time taken for the reaction to block out the black cross. Repeat this for each of the concentrations of THIO being investigated. Do this twice as to make it a fair test and to identify any anomalies. Safety - refer to page 7 in 'part 1: temperature' to see classroom and experiment safety.

  1. Factors Affecting the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate.

    - increasing the temperature of particles increases their amount of energy. This means they move around more and have an increased chance of colliding together and reacting. Also, by increasing the amount of energy the reactants have you increase the chance that the certain activation energy point has been reached.

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

    This means that for the main experiment, we are going to change the concentration of sodium thiosulphate, and keep the concentration of hydrochloric acid constant. This will accurately show the effect of concentration on the rate of reaction. In the main experiment, the total volume is going to be 60 cm3.

  1. Investigating the factors influencing the rate of reaction between Sodium Thiosulphate and Dilute Hydrochloric ...

    In this solution of Sodium Thiosulphate and Hydrochloric acid, there are only a few Sodium Thiosulpahte molecules to collide with the acid molecules. This means there is less chance of collisions occurring and a less probability of effective collisions occurring to form a product. This reduces the rate of reaction.

  2. Investigation of some of the factors affecting rates of reaction.

    When the cross could no longer be seen though the sulphur suspension then the stopwatch was stopped. The time will be recorded and the rate of the reaction will be calculated as in the equation above. The experiment will be repeated with the other four concentrations of thiosulphate.

  1. Experiment to investigate the effect of changing temperature on the rate of reaction between ...

    This is why it is important to keep this variable constant .To do this; I will need to do the experiment on the same day if possible. This ensures that the differences in room temperature, however small, do not affect the rate of reaction.

  2. Investigation of the rate of reaction of sodium thiosulphate with dilute hydrochloric acid.

    If particles collide and reach the activation energy that they would produce a fruitful collision, which means that they have collided with enough energy to break old bonds and form new ones, this is when a chemical reaction occurs. But if particles don't reach the activation energy when they collide,

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