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

Rate Of Reaction

Extracts from this document...


Aim: The rate of reaction can be altered by varying temperature or concentration, or by changing the surface area of a solid reactant, or by adding a catalyst and increasing the pressure. Here I have listed the I am going to investigate the reaction between hydrochloric acid and sodium Thiosulphate, which is a precipitation reaction, and their rate depends on temperature and the concentrations of the solutions. I will repeat this experiment at several different temperatures and concentrations. I am going to observe how the concentration and temperature will affect the rate of reaction (temperature /average time).Below is the word and symbol equation that they react in. Sodium Thiosulphate + Hydrochloric acid -> Sodium Chloride + Sulphur + Sulphur Dioxide + Water Na2S2O3 (aq) + 2HCl (aq) -> 2NaCl (aq) + S (s) + SO2 (g) + H2O (l) Prediction: For temperature I have predicted that when the temperature is increased the time and rate are likely to decrease as the reaction will happen faster. I predicted this because of the collision theory, and because I was certain that the higher the temperature would be the faster the particles will moves, therefore they will combine quicker with the other substance which is likely to make the reaction faster. The solid sulphur formed in this reaction makes the colourless solution go cloudy. Concentration, just as increasing the temperature will increase the number of particles colliding, so will the concentration. This experiment is basically about more particles into the reaction, the probability of the colliding (crashing) is increased so the reaction is bound to take place faster. This variable is continuous and independent. As I mentioned in my aim I will be experimenting on this reaction. I predict that by doubling the concentration of the acid, the rate of reaction will double, however the time will decrease as it is happening faster. I am going to test the two variables concentration and temperature. ...read more.


Temperature: Prepare the following solutions: *??Hydrochloric acid *??Sodium thiosulphate Rinse, clean and set up the apparatus. Measure out 20 cm of both of the solutions; this can be increased depending on the investigator will. However as this test is about temperature it is absolutely essential that the amount of both of the solutions is identical as this will make it a fair test, which is essential for reliable and accurate results. Pour the sodium thiosulphate into a clean conical flask. Leave the HCL in the measuring cylinder, however make sure that you don't drop it hence put it in a safe place. Get the heat proof mat - then place it on the work place. After this is I shall get the tripod and place in on top of the heat proof mat. Then collect the gauze and place that upon the tripod. Put the Bunsen burner beneath the tripod. There is a rotatable part close to the bottom of the Bunsen which should be turned so that the air hole. This would make the flame on safety form. A rubber pipe should be attached to the source that provides the gas, and to the Bunsen burner. The gas should only be turned on once the Bunsen is ready to light. Place the match or a stick with a little flame (or any source that provides a flame), on top of the Bunsen and then it will catch fire. Then get the conical flask with sodium thiosulphate, place a thermometer inside it. Use the tongs or you hand to place the conical flask on top of the gauze that is placed on the tripod. Now as I am heating the liquid, to speed thing up, I will rotate the part on the bottom of the Bunsen so that the air hole is closed. This should be stopped when the temperature is 20�, as this is the lowest one I will test. ...read more.


As a result, they take up more space, and the substance expands. At lower temperatures, particles have less energy, move more slowly, and have fewer collisions. They take up less space, and the substance contracts. Increasing the concentration of something means having more particles in a certain amount of space. Moreover, as the result of the number of particles increase the space gets squashed so there is a higher chance that they will collide and react. Therefore, when the 2 liquids are poured into the reaction vessel there are more particles so reaction is faster Although I predicted that concentration would have the greatest affect on the reaction rate, it was in fact temperature. This was mainly because the concentration was tested at room temperature which wasn't enough to get many of the particles to activation energy levels. In addition, in the solution there were plenty of particles so concentration wasn't important. Evaluation: The investigation could have been improved by testing the temperature variable on the computer as the. It would also have helped to test each concentration and temperature more than once to ensure that the results were true. I could also have used a burette to measure out the reactants although the measuring cylinder was quite accurate. I think I could have improved my investigation by: � Obtaining more results to get a better overall result. � I used ICT to display my coursework, but I did not use it in any way that affected the experiment. � I would like to do a further experiment to confirm my results. However I am restricted by time and the available facilities which means I cannot repeat it. � Also instead of using a cross on a piece of paper I could use a single beam of light until it could no longer be seen � Use of computer to aid analysis of results ?? ?? ?? ?? Science Coursework: Rate Of Reaction Candidate Name: Farhan Khalid 9Sc5 Centre Name: Wembley High Technology College Centre no: 12346 Teacher: Mr Bullock Page 1 of 17 ...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. Sodium thiosulphate and hydrochloric acid Investigating how the rate of reaction is affected ...

    Pick 5 temperatures to use in the experiment 7. Label the two beakers one "hydrochloric acid" and the second "sodium thiosulphate" 8. Place a Bunsen burner under a flask containing water. This is known as a water bath 9. Heat until desired temperature is reached 10.

  2. To investigate the effect of varying the masses of white sugar and yeast and ...

    In bread baking, fermentation occurs due to a conversion of sugars (technically, glucides or sugars, naturally present in the flour) to alcohol and carbon dioxide under the effect of commercial or naturally occurring yeast and bacteria. This is categorized as alcoholic fermentation.

  1. Find out how the rate of hydrolysis of an organic halogen compound depends on ...

    charge, or it may be part of a neutral molecule (as with the bromobutane reaction above) and carry a partial positive charge as a result of bond polarisation. If we write X- as a general symbol for any nucleophile, the nucleophilic substitution process can be described by: In general, when any nucleophile X- reacts with a general haloalkane R ?

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

    solution * Tripod - To hold the beaker * Gauze - To put on top of the tripod * Beaker (100cm3) - To hold the chemicals in * Measuring Cylinder (50cm3) - To measure the volumes of thiosulphate and acid and water to use.

  1. Give an account of the properties and uses of phenol

    Lithium is useful in making the anode (+) of a lithium cell while barium salt is used for making X-ray exposure of the bowel. Group I metals are reactive towards air and should be stored in paraffin oil. 5. Give an account of the study of reaction rate, detailing various methods of measurements.

  2. Find out if doubling the concentration and the temperature will double the reaction rate.

    This is because twice as many HCl particles will be present than previously and there will be twice as much chance of the calcium carbonate chips colliding with the concentrated hydrochloric acid. Therefore when the concentration is double the time take for the reaction should be halved.

  1. Understand factors that affect the rates of chemical reactions - temperature, concentration of reacting ...

    You will still need to show students how to do the experiment. You will also need to check the groups to see that they are following the directions. MATERIALS FOR EACH GROUP Give each group (of 4) the following: 1 test tube rack 9 test tubes 1 container of vinegar 6 pieces of chalk (1/8ths of stick)

  2. Investigate various ways of increasing the rate of a chemical reaction and evaluate which ...

    consider a specific reaction and evaluate which of the methods above would be of most use. Reagents: The reactants we shall use are as follows: 15cm3 of .5mol/dm3,1mol/dm3, 2mol/dm3 and 5 mol/dm3 of Hydrochloric acid. Distilled water (to make up different concentrations if necessary)

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