• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9

Test the affect of concentration of sodium Thiosulphate on the rate it&amp;#146;s of reaction with hydrochloric acid.

Extracts from this document...


Background Information Rates of Reaction; The rate of reaction is the rate at which two substances react with each other. These are the variables affecting rates of reaction- * The concentration of the reactants, the more concentrated the shorter the time it takes to react, as there are more particles to react. * The surface area of the reactants, the larger the surface area the shorter the time it takes to react as there are more particles that the other reactants have contact with. Only the particles on the surface can react, if more are exposed more can react in the same period of time. * In a gas reaction if you increase the pressure the rate of reaction is increased because there are more particles to the same volume. * The higher the temperature of the reactants the shorter the time taken to react because particles gain more energy and move around more (see collision theory) and therefore collide more often with other particles. * Catalysts- a catalyst increases the rate of reaction. Collision theory; All these variables affects on rates of reaction are true because of collision theory. Substances can only react when their particles collide, the faster they move or the more of them there are increases the number of collisions and increases the number of reactions in a certain time, reducing the reaction time. ...read more.


Time how long it takes until you can no longer see the cross through the bottom of the flask (because of Sulphur forming on the bottom of the flask). 4. Repeat steps 1-3 twice more for 0.1M sodium thiosulphate Repeat steps 1-4 for the other four concentrations. Equipment List; * Measuring cylinders-one for hydrochloric acid, one for sodium thiosulphate * Flasks for sodium thiosulphate concentrations * Stop clock * Paper with cross on * Flask for reaction to take place in Prediction; I predict that the stronger the concentration the faster the rate of reaction. I think this will happen because there will be more thiosulphate particles to the same volume of solution in the 0.1M solution than in the 0.02M solution, therefore there will be a higher chance of collision and more collisions per second. See below- 0.08M Sodium Thiosulphate Solution (thio:water=4:1) Water particles: 10 Sodium thiosulphate particles: 40 Hydrochloric acid particles: 5 0.08M Sodium Thiosulphate Solution (thio:water=4:1) Water particles: 40 Sodium thiosulphate particles: 10 Hydrochloric acid particles: 5 I have also previously performed an experiment reacting magnesium with hydrochloric acid- Mg+2HCl?MgCl2+H2 I varied the concentration of the hydrochloric acid and my results showed the stronger the concentration of the acid the faster the rate of reaction Other Sources say; "The number of collisions per unit time can be expected to grow with the number of molecules of the reactants available" The University of Delaware "The more concentrated (the reactants) ...read more.


Firstly I could use a water level sensor like those found in washing machines. The computer is programmed to stop filling the container when it senses that the water has reached the level; Also I could use the weight of a liquid to determine its volume more accurately. The container is set on some electronic scales that are interfaced with a computer. The scales are set at zero with the flask on them, and then it is filled by a source controlled by the computer. When the computer senses through the scales that the container has a certain weight of liquid that it knows is the weight of the desired volume it shuts off the liquid source. Other experiments I could try- The affect of Temperature The reason I did not investigate the affect of temperature on rate of reaction was that it would be too difficult to control with a Bunsen burner and I would have had very inaccurate results. However, if I used a water bath to regulate the temperatures of the Sodium Thiosulphate this experiment would probably be quite successful. I would test it a 20 0C, 30 0C, 40 0C, 50 0C and 60 0C. I predict that an increase in temperature would cause an increase in rate of reaction, as the atomic particles would have more energy and move around faster, causing them to collide more often. ?? ?? ?? ?? How does the concentration of Thiosulphate affect the rate of reaction with Hydrochloric acid Esther Hubert 1 ...read more.

The above preview is unformatted text


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


    Apparatus: * 8g/Litre Sodium thiosulphate solution (0.15 mol.dm-�) * 2M Hydrochloric acid (dilute) * Distilled water * Stopwatch (accuracy to 100th of a second) * Thermometer (0-110�C), measures in 1�C units. * White paper/card with a large black cross (X)

  2. Free essay

    Close Your Eyes

    I just wanted to get out of here. I was just about to get up and walk out when I felt an arm around my shoulder. I uncovered my face and looked up at who's arm it belonged to. It was a blonde haired girl.


    --> 1NaCl (aq) + H2O + SO2 (aq) + S (s) The reactants begin as clear liquids. During the experiment sulphur is produced. This makes the clear reactants turn cloudy until the reactants become opaque. This is how I am going to measure the amount of time the different concentrations take to react.


    This is also tied in with the kinetic theory because I think the molecules gain their energy from being heated. The rise in temperature will not only increase the number of effective collisions but they will also allow the particles to produce more energy, as the collisions will be more vigorous.

  1. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    As the hydrochloric acid reacts with the sodium thiosulphate, the solution will become cloudy and the light will no longer be visible through it. This will happen quicker if the hydrochloric acid is pure. The volume of sodium thiosulphate used could affect how quickly the reaction occurs.

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

    solution will need to be at for the desired resultant temperature to be achieved when the HCL is added. Trial experiments: Before we could start the experiment we needed to run some trial experiments to see if our method was correct and to decide what concentration to use.

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

    You could also include a variable table: Type Variable Value How Measured Dependent Variable Rate of Reaction Colour change eyes Independent Variable Concentration Mils Etc... Controlled Variable Controlled Variable Controlled Variable I have decided to investigate concentration, as it is the simplest experiment to perform with the equipment I have available.



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