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To investigate the rate of reaction between Sodium Thiosulphate (-Na - _2 S_(2 ) O_3) and Hydrochloric acid (HCl)?

Free essay example:

To investigate the rate of reaction between Sodium Thiosulphate (image00.pngimage00.png and Hydrochloric acid (HCl)?

Introduction:

To investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric acid. I predict that the temperature will play a big role in the experiment because when the water is heated or the temperature is raised the reaction will happen quicker, on the other hand I believe that if the concentration is low then the reaction will be slow. Also the particle theory shows us that when the temperature is high the particles move around much faster therefore the rate of reaction increases hence the rate of reaction depends on things such as temperature, concentration of chemicals and the surface area of the reactant. I will be doing this investigation in many different ways such as varying the temperature or the concentration of the hydrochloric acid and also I will use a calorimeter which will give me an accurate reading of how much light is absorbed and when the solution has turned cloudy and no light can transmit through it.

This is the word equation for this reaction:

Sodium Thiosulphate

+

Hydrochloric Acid

image01.jpg

Sulphur Dioxide

+

Sulphur

+

Water

+

Sodium Chloride

The reaction can also be expressed as a symbol equation:

Na2S20 3 + 2HCl image01.jpgSO2 + S + H20 + 2NaCl

Apparatus:

  1. 2 Measuring cylinders
  2. Hydrochloric acid
  3. Sodium Thiosulphate
  4. Distilled water
  5. Piece of paper
  6. Pen
  7. Stopwatch
  8. 2 Test tubes
  9. Calorimeter
  10. Cuvette
  11. Water bath

        Paper with X on it        

Distilled water        Sodium Thio-                2 measuring

        Sulphate                cylinders

        HCl

Method:

  1. Firstly collect all the equipment listed.
  2. Then following the table fill up each measuring cylinders with the amount of substance needed.
  3. Label each cylinder with the name of the substance you first put in it.
  4. Put the chemicals for the time being in a place that will keep the substances at their same temperature.
  5. Then pour the Sodium Thiosulphate into the measuring cylinder.
  6. Then follow that up by pouring both the HCl and distilled water (if any) at the same time into the cylinder.
  7. As soon as you pour them into the measuring cylinder then pour them in the test tubes and start the stopwatch.
  8. Keep on observing the test tube until you cannot see the X.
  9. As soon as you can’t see the X stop the stopwatch.
  10. Record the time you get and carry on the experiment.
  11. Once you have got a full table of results draw a graph and repeat the whole experiment again.

Safety:

To make sure that me and my team carry out my experiment safely I will wear firstly goggles throughout the experiment as that is Miss Essiens golden rule. We will keep the equipment safe by elected a team member to protect the equipment so that nothing will break. I will also make sure that the surroundings I am working in are clear. For example, I will move any bags, coats or books out of the way hence I will wash my hand before I make any contact with the equipment and also wash my hands after the experiment has finished.

Fair Test:

To make my experiment a fair test for each of my solution I had to keep 10ML of Thiosulphate and also when I repeated the test I had to keep the concentrations the same. To make it a fair test I made sure I washed all my equipment with distilled water so that when I repeated the experiment I knew how much I was using.

Preliminary test

In the preliminary we did the experiment at room temperature which is (36-37 degrees) starting at a concentration of 1M. We had to measure out 10ML of Sodium Thiosulphate and 10ML of Hydrochloric Acid. We then poured the Hydrochloric Acid in to the Thiosulphate and then timed how long it takes for the solution to turn cloudy on the X. We did the preliminary so that we know what to do in the upcoming experiments such as the one where the room temperature varies.

This student written piece of work is one of many that can be found in our GCSE Aqueous Chemistry section.

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