To investigate the rate of the reaction between different concentrations of Hydrochloric acid and sodium thiosulphate

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Rates of Reaction Coursework.

Planning

Aim: To investigate the rate of the reaction between different concentrations of Hydrochloric acid and sodium thiosulphate.

Method:

  1. Get a piece of card which has a black cross on it and place underneath a conical flask
  2. Get three measuring cylinders. Using one, measure out the amount of Hydrochloric Acid and in the other measure out the Sodium thiosulphate, in the third measure out the amount of water.
  3. Once the correct amounts are measured in the measuring cylinders, put the sodium thiosulphate and water into the conical flask.
  4. Make sure the stopwatch is ready and at the same time pour the acid into the conical flask as well as starting the stopwatch.
  5. The observer needs to watch the reaction and stop the stopwatch as soon as the black cross on the card is not viable.
  6. The results need to be recorded.

This method needs to be repeated for the following amounts of Hydrochloric Acid, Sodium thiosulphate and water.

Experiment         Hydrochloric Acid                 Sodium Thiosulphate _                Water

                         (ml³)                                   (ml³)                        (ml³)

  1.                  5                                50                             0
  2.                  5                                40                            10
  3.                  5                                30                            20
  4.                  5                                20                             30
  5.                  5                                10                            40
  6.                  5                                  0                             50        

To record my results, I plan to time how long it takes for the cross on the piece of card to disappear.  The results I will then put in a table.

Equipment:

  • 2 50ml measuring cylinders
  • 1 5ml measuring cylinder
  • 1 Conical Flask
  • Stop Watch
  • Card with black Cross
  • Dropper
  • 5ml Hydrochloric Acid x 5

  • Sodium Thiosulphate:

50ml x 1        40ml x 1        30ml x 1        20ml x 1        10ml x 1                                                    

  • Water:

10ml x 1        20ml x 1        30ml x 1        40ml x 1        50ml x 1

A rate of reaction is the speed at which the chemical reaction occurs.  The reaction can only occur when the reactant particles collide against one another. However, it is not always that the collisions will be successful enough to form product molecules. Therefore it depends on reactant molecules and if they can collide with enough energy to break the original bonds so that new bonds in the product molecules can be formed.  A condition that will increase the energy of the particles or the chance of a collision will then in turn increase the rate of reaction.

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The five main factors that increase the rate of reaction are:

  1. Temperature
  2. Concentration
  3. Surface Area
  4. Catalyst
  5. Pressure

I intend to investigate how changing the concentration of Sodium Thiosulphate has an effect on the rate of reaction.

Key factors:

  • I’m going to use  no sodium thiosulphate in one reaction as a control to see if the acid is reacting with the sodium thiosulphate and how it affects the rate.
  • The temperature will remain constant at room temperature as an increase in temperature can increase the rate of reaction as it speeds up the movement ...

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