• 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 between Sodium Thiosulphate and Hydrochloric Acid.

Extracts from this document...


Factors affecting the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Prediction I think the time the cross takes to disappear will decrease as the concentration of sodium thiosulphate increases. This prediction is based on the 'collision theory' and all of the results and analysis will be based on this theory. Apparatus Conical flask, measuring cylinder, stopcock, paper with cross on it, hydrochloric acid, sodium thiosulphate. Method Firstly measure 50cm of 1.0mol/dm sodium thiosulphate solution using the conical flask. Then add 5cm of 2.0mol/dm of hydrochloric acid to the flask containing the sodium thiosulphate. Then place the flask over the cross. Then start the stop clock immediately and time how long it takes for the hydrochloric acid and the sodium thiosulphate to mix. When the cross on the paper completely disappears stop the clock. Repeat the experiment again for 0.2, 0.1, 0.05, 0.025 and 0.0125. To make my experiment a fair one, I will look at a lot of things. Firstly, I will look at the factors that may affect how well the investigation would work and these are things like using different equipment or doing the actual experiment in different conditions i.e. ...read more.


This clearly shows that when the concentration is greater, an experiment occurs quicker. As the concentration was halved the time taken for it to completely react doubled. As we can see it took 30 seconds for 0.2mol to react and it took 1 minute for 0.1mol to react. The time continues to double as the concentrations are halved. In the results we can see that as the concentration of the solution decreases the time taken for the reaction increases. The times for the reactions increase proportionally as the concentration decreases. The Rate of Reaction varies greatly. Some chemical reactions like explosions happen very quickly while others like rusting take time and happen very slowly. The rate of reaction can be affected by a number of factors: temperature, concentration, pressure, adding a catalyst and surface area . The one that I have investigated is Concentration. The factors that affect the rate of a reaction are called the collision theory. When the concentration is higher there are more particles so the number of successful collisions increases. The minimum energy needed for a successful collision is called the activation energy. ...read more.


As there was less energy the time for the reaction to occur increased. Evaluation I think that this experiment has been completed successfully. My results were accurate as each measurement was checked carefully. There were no anomalous results within my results table and I think this was because of the extreme care that I put into making sure that the experiment was set up correctly with careful measuring. I feel that I should have repeated my results to make sure that the results that I obtained were not incorrect. In the table you can see that for the smaller concentrations of Sodium Thiosulphate, which was mixed with distilled water the molecules were less dense and so the activation energy was not reached as quickly. As there was less energy the time for the reaction to occur increased. Overall, this investigation has been a very successful one. I feel my results and analysis have been as precise and reliable as they could have been under the time given. However I feel with extra time, I could have repeated the experiment and made it even more accurate and adapted it to try other variables for example Temperature or adding a catalyst. This would have furthered my investigation. ...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 Factors Affecting the Rate of a Chemical Reaction

    Results Temperature of THIO (actual temperature in brackets)(oC) 1st Test 2nd Test Average Rate (1/avg time) (s-1) 1st test 2nd test Time taken for reaction (s) Rate (1/time) (s-1) Time taken for reaction (s) Rate (1/time) (s-1) 20 (19) room temp (18) 270 0.004 274 0.004 0.004 30 (33) (31)

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

    Although I have researched over the Internet, I cannot find a suitable catalyst for my reaction. Even if I was to trial different substances I cannot get continuous data. * Concentration (Type ie concentration is controlled) - increasing concentration increases the amount of active reactant particles in a given volume.

  1. Investigate the factors affecting the rate of a reaction.

    If I make sure I follow these few safety procedures, I know that my investigation is safe and that know one will get hurt. There were several factors in my investigation. The ones I kept controlled (the same) were the Sodium Thiosulphate, the Hydrochloric Acid and also the same amount of acid used (20ml)

  2. Investigation Into the Factors Affecting Rate of Reaction

    I will also make sure I do not inhale the solution as this may irritate my body and finally I will make sure I report and spills to my teacher immediately. Apparatus Hydrochloric Acid- The amount will change during my experiment Sodium Thiosulphate- This will be kept the same during

  1. An Investigation into the factors affecting the rate of reaction between magnesium and hydrochloric ...

    could have also affected the calculated rates of reaction. To improve the experiment I would find a way of attaching and releasing the magnesium inside the side arm tube above the acid (with a bung at the top of the side arm tube)

  2. Factors Affecting Enzyme Activity

    The reason for their being gas produced on my graph for the control experiment is that when I inject hydrogen peroxide into the apparatus this will displace gas and therefore will casue some gas to be collected in the gas cylinder.

  1. An Investigation of factors affecting rate of reaction between an acid and a metal.

    I am going to use 4cm of Mg ribbon each time. I am going to decide when to acknowledge the Mg has totally reacted, so the experiment is carried out fairly (when all the effervescing has stopped and all the Mg, even the smallest particle, has disappeared)

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

    four results are all of a similar time, so it would be difficult to distinguish a good relationship if I were to change the acid. Therefore, I decided I would test the effect of changing the concentration of the sodium thiosulphate.

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