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

The aim of this investigation is to see how fast a reaction occurs between sodiumthiosulphate and hydrochloric acid when we change important factors such as concentration of the solution

Extracts from this document...


Investing reactions between sodiumthiosulphate and hydrochloric acid. Aim The aim of this investigation is to see how fast a reaction occurs between sodiumthiosulphate and hydrochloric acid when we change important factors such as concentration of the solution, the surface area, the temperature and whether or not a catalyst is present. Prediction I predict that the higher the concentration of the fixer (hydrochloric acid) and the lower quantity of distilled water the rate of reaction will be a lot faster. Scientific theory There are certain factors that can affect the speed of reactions. These are temperature (affects the movement/speed of the particles), concentration of the solution and the surface area. These factors are part of the collision theory. The collision theory explains that a chemical reaction can only occur through particles colliding. These particles must collide with enough energy to break the existing bonds. This energy that you need to have is called the activation energy. Out of the four variables I have chosen concentration of the solution as my variable. The other three variables will be kept the same to ensure a fair test. ...read more.


STEPS I'M GOING TO TAKE: 1) Wear goggles 2) Collect equipment and place on my working place 3) Mix thio and water to the correct ratio and then place in reaction beaker. 4) Get 10cm3 of hydrochloric acid and add to reaction beaker 5) Start the stopwatch and stop it when the 'x' cannot be seen. 6) Dispose of chemicals in the waste jar provided. Preliminary experiment. To check if there would be any difference between the high and low concentration of thio and whether the results would happen in a reasonable time I performed a trial experiment to find out. I personally thought that 25ml of water with no thiosulphate would not react and the 25ml of thiosulphate with no water would react very quickly. These were my results for the trial experiment: High concentration (25ml thio~0 ml water)-18.13 seconds Low concentration (20ml water~5ml thio)-165.31 seconds (I didn't use the solution of 25ml water~0 thio because it didn't react) Now I knew this I conducted a more thorough experiment based on these results and compared them to my new results. ...read more.


There is a much higher chance of collision in this solution due to the increase of thio giving the solution more particles to collide. In diagram 3 however I used a higher concentrated 2m acid with no water in it. There was 15 thio particles, 10 water particles and 10 acid particles. There is a good chance of a fast reaction in this solution due to the 10 acid and 15 thio particles, which will have a strong chance of collision. These experiments prove that a higher concentration of acid and thiosulphate will result in a faster reaction. Evaluation I felt that the experiment went fairly good but there are still a lot of points that could be improved on. We had some anomalies during our practical experiment such as the 15ml thiosulphate and 10 ml water. Reasons for this may be the person conducting the experiment forgetting to stir the solution or a miscalculating in the measurements of the two chemicals. The investigation could be improved by making sure all measurements were taken accurately. You could also make sure you stir all of the solution a certain amount of times (so it's a fair test). ...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 Aqueous Chemistry 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 Aqueous Chemistry essays

  1. Rates of Reaction

    I have thus decided to use medium chips as it gives a clear average on the whole. In addition to this the small chips and powder would react too quickly with the hydrochloric acid especially when using a higher concentration of acid in the given space of time.

  2. My Aim is to see how concentration of acid will affect the time it ...

    the results changed dramatically to the other two experiments. In the first experiment as I predicted the 8cm� of Hydrochloric acid against the 2cm� of Water reacting with the Sodium Thiosulphate had almost double the rate of reaction to the 4cm � of Hydrochloric acid against the 6cm� of Water reacting with the Sodium Thiosulphate, the margin was 1.6%, this is what I expected.

  1. An investigation into the factors affecting the rate of reaction of indigestions tablets with ...

    However, there are also other variables as well that will affect the experiment if not considered. With a higher concentration there is more particles per volume of substance. This means the more concentrated the acid is, the more particles there are ready to collide with the tablet particles (which are the same in all experiment).

  2. Finding out how much acid there is in a solution.

    Clean up any spillages. * Make sure that you clean up any spillages due to washing the glassware with distilled water or using other chemicals so that floors are not slippery, for the safety of other people. * Keep the laboratory ventilated. * Do not reach over chemicals or equipment to avoid spillages and breaking equipment.

  1. What factors affect the rate pf reaction between sodium thiosulphate and hydrochloric acid?

    the experiment for 2 hours so they can adjust to room temperature. Same conical flask used; this is so that it is a fair test so I can compare the result with the results from other experiments conducted in the same conical flask.

  2. "What Affects How Quickly Sodium Thiosulphate (thio) Goes Cloudy?"

    If there were to be only 0.04M of thio, the reaction would be far lower than if there were to be 1M of thio. Below is a diagram of Hydrochloric acid and thio: 1.

  1. Deducing the quantity of acid in a solution

    I will then invert it a further ten times to ensure complete mixing. I will then label the flask as "Na2CO3 solution", inform that it is an irritant, and leave a space for the concentration to be filled in after I have calculated it. Equations: Na2CO3(s) + H2SO4 (aq)

  2. Rate of Reaction

    For example if sodium thiosulphate was heated at 20oC the movement energy in the particles is less, and is more likely to be below the activation energy whereas at 60oC the movement energy in the particles is higher, making it more likely to be above the activation energy.

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