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

PLAN for the investigation into the affect of the concentration of Sodium Thiosulphate on its rate of reaction with hydrochloric acid.

Extracts from this document...


Chemistry- PLAN for the investigation into the affect of the concentration of Sodium Thiosulphate on it's rate of reaction with hydrochloric acid. Rates of reactions are affected by four main factors of reactants which are the size of the particles of the reactant, the temperature of the reactant, the concentration of the reactant and adding a catalyst into the solution. As shown by the title the main one which will be focused on in this planning and experiment is the concentration of the solution of sodium thiosulphate. This affects the rate of reaction as the more concentrated reactant 1 is the more particles of the acid there are which come into contact with reactant 2, and then this means more particles from reactant 1 are reacting with reactant 2 and so this means the rate of the reaction is faster. APPARATUS: DIAGRAM: 160cm3 of sodium thiosulphate 110cm3 of water 5cm3 of hydrochloric acid at 1M Measuring Cylinder Beakers Conical Flask Paper with X PREDICTION: So my above information on the rate of reactions to do with concentration concludes my prediction, as, my prediction is the more concentrated the sodium thiosulphate the more faster the reaction between the sodium thiosulphate and hydrochloric acid will be. I think this will be the case because as shown above the more concentrated the thiosulphate is the more particles of it there will be that react with the hydrochloric acid, so this will make a faster reaction and make the cross disappear faster aswell. ...read more.


The hydrochloric acid in this experiment is a controlled variable as it's being controlled and not going to change, so it will stay at 5cm3 at 1M, and the time/rate of the reaction that makes the X disappear is a dependent variable as this variable's outcome depends on the independent variable and it's going to be measured by me. Additionally the environmental temperature is a controlled variable as the temperature at which the experiment will be done is at room temperature and that will be kept constant. Also this experiment was repeated by using the other sodium thiosulphate from the beaker but firstly the beaker was rinsed out to get rid of cross contamination. Then sodium thiosulphate was poured into the beaker but 10cm3 less from the previous experiments were poured into each experiment followed by another. But before it's poured into the conical flask the water is poured into it to lower the concentration. And the amount of the water in each experiment was the amount which when added to the amount of sodium thiosulphate equals 50cm3, and this again was measured using the measuring cylinder. Then the rate of the reaction was noted as well by doing 1/TIME taken for the cross to disappear. This investigation was repeated one or two more times to get better results and check to make sure no result was way out, it also gets an average. ...read more.


The improvements which would improve the end results and make them similar to the preliminary results are doing the whole experiment under the same conditions of temperature, so do it in a room where the temperature is always constant so this won't affect the rate of reaction and so the results. Also making sure eyesight is good so make sure the goggles worn aren't affecting whether the cross can be seen or not, make sure glasses which are worn are glasses which make the eyesight see fully and make sure glasses are worn if need be to improve the eyesight, and this makes the results more accurate. Lastly making sure the equipment is washed and the contents of it is emptied only when different solutions are needed to be put into the equipment, so this gets rid of cross contamination so it won't affect the results. Or having different equipment, where there is equipment for each solution, so the measuring cylinder and beaker for each. This can differentiate between which solutions are to which equipment and not getting confused between thinking was this solution in here or this one, which is done by having the contents of the solution in a beaker with a label of its solution. This gets rid of any cross contamination coming in and there is no need for washing except washing the conical flask, and also pouring the solution out of the measuring cylinder is needed to be done so other volumes of the solution can be measured. ...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. Find out how the rate of hydrolysis of an organic halogen compound depends on ...

    This will therefore remove the need of eye judgement. There were many steps that were taken during the experiments to ensure that accuracy, precision and reliability were ensured. For instance, the temperature of the heated water was constantly being watched while the experiment proceeded - this was done to create

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

    Apparatus Method In my investigation I will be using the following reaction: Sodium thiosulphate + hydrochloric acid --> Sodium chloride + water + sulphur + Sulphur dioxide Na1S2O3 (aq) + 2HCl (aq) --> 1NaCl (aq) + H2O + SO2 (aq)

  1. How does the Temperature affect the Rate of Reaction between Sodium Thiosulphate and Acid?

    They are both similar and both deal with the movement of particles. Kinetic theory is how fast a molecule moves and the amount of energy it has and so when a molecule is heated at a higher temperature it will move at a greater speed and more vigorously.

  2. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    the particles that separate from each other are chemically different from those that collided. Variables: My independent variable is the concentration of hydrochloric acid because it is the variable that I'm changing. By diluting the hydrochloric acid, the reaction will occur slower because there will be less hydrogen and chlorine

  1. How does the Temperature affect the rate of the reaction between Sodium Thiosulphate and ...

    only parts of the experiment, which will be changed, all the others will remain constant. V1 and T 1 are the volume and temperature of the water and sodium thiosulphate solution, the volume will be 50 ml for the whole experiment and the temperature will vary.

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

    This means that there is an increased chance of collision so the frequency of collisions increases, and the reaction rate will speed up. Performing my experiment with increasing concentrations of hydrochloric acid would be relatively straightforward to do and would produce a line graph of continuous data.

  1. 'How does the concentration of Sodium thiosulphate solution affect the rate of its reaction ...

    I shall try to make sure that the temperature stays the same throughout the experiment as, if the temperature of the solution increases, the particles in the solution move around faster and the chances of a collision become higher, so it would not be fair.

  2. How Does The Concentration Of Sodium Thiosulfate Affect The Rate Of This Reaction?

    I made sure the volume of Sodium Thiosulfate solution each time equalled to 10cm3 . The one thing I kept consistent was 10cm3 of Hydrochloric acid. I varied the concentration of the Sodium Thiosulfate and water. Below is a results table for my preliminary experiment.

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