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

Chemistry SC1 Investigation: How does the temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

Extracts from this document...

Introduction

Chemistry SC1 Investigation: How does the temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid? Skill P - Planning: Background: Sodium Thiosulphate is white solid with the chemical formula Na2S2O3. It can be made by reacting sulphur dioxide with sulphur in boiling sodium hydroxide solution. S + SO2 + 2NaOH � Na2S2O3 + H2O Hydrochloric acid is a colourless, corrosive, non-flammable liquid. Its formula is HCl. Factors that could affect the rate of reaction between sodium thiosulphate and hydrochloric acid: * The concentration of the hydrochloric acid. If the acid has a high concentration e.g. 5moles/litre, it will react quicker than a less concentrated, more dilute acid. * The concentration of the sodium thiosulphate will also affect the rate of reaction in the same way. * The temperature of the sodium thiosulphate, thus the temperature the reaction will take place at, will affect the rate of the reaction. At lower temperatures, the reaction will take a long time, as little heat energy is available for the hydrochloric acid and sodium thiosulphate molecules to convert into kinetic energy. ...read more.

Middle

How the experiment will be carried out: Apparatus required: * 1x Tripod * 1x Bunsen burner * 1x Gauze * 1x Heat-proof mat * 1x Tile with black cross on it * 1x Stopwatch * 1x 100�C thermometer * 6x 150cm3 beakers * 6x 50cm3 water/sodium thiosulphate mixture (20cm3 thiosulphate and 30cm water) * 6x 5cm3 2M/litre hydrochloric acid Diagram of how the apparatus will be set up: Method: The apparatus will be set up as shown on the previous page. The sodium thiosulphate (40g/litre) / water mixture (20cm3 thiosulphate and 30cm3 water) will be heated to the desired temperature, then placed on the tile with a thick, black cross drawn on it. The cross will be observed from above, the 5cm3 of 2M/litre hydrochloric acid added and the timer started. The reaction will be observed and the timer will be stopped when the reaction is completed and turns so murky, that the cross will no longer be visible from above. Each experiment at each temperature will be repeated twice. This is so we can get an average in results, rather than just one anomalous one. ...read more.

Conclusion

The dependant variable, the one we will record in our results is the time taken for the completed reaction. The temperature will affect the rate of the reaction. The higher the temperature, the quicker the rate of reaction, thus the reaction time will be less. At low temperatures e.g. 20�C and 30�C, the reaction will take much longer. This is because little heat energy is being given out from the sodium thiosulphate. Thus, little is transferred into kinetic energy for the hydrochloric acid and sodium thiosulphate molecules. The reaction time is longer, because, with little kinetic energy, the molecules are moving around slowly, the chances of a successful collision between molecules is low, and even so, in some collisions, there wont even be enough activation energy for the molecules to combine and react. At higher temperatures, however, there is a lot of heat energy being converted into kinetic energy for the molecules. As they are moving around much faster, the chance of collisions between molecules is increased, and there will almost certainly be enough activation energy to combine the molecules. Thus the reaction time will be a lot less than the same experiment done at a lower temperature. Olek Zydron 10MS 1 ...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. How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

    * Once I have done this I will press the stop clock * When I can no longer see the black cross I will stop the stop clock and record the time. * I will repeat this for all five reading, and then do repeats of the five readings.

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

    It was very difficult to tell when the cross was completely gone and the reactants completely opaque which could explain my anomalous results. A more accurate and precise way of measuring when the reaction had finished could be using a light sensor connected to a computer underneath the conical flask

  1. The reaction between Sodium Thiosulphate and Hydrochloric Acid.

    up Conclusion: From my graph, you can see that there is a strong negative correlation between the time taken for the reaction to complete and the concentration of hydrochloric acid. This means that as the concentration of the hydrochloric acid is decreased, so is the rate of reaction.

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

    In a less concentrated acid the number of particles would be lower, so the rate of reaction is slower whereas in a more concentrated acid the number of acid particles is greater so the number of collisions is greater and the rate of reaction is faster.

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

    The time taken to reach this point could be changed by increasing or decreasing the number of reactions, which took place every second. This could be done in two ways: a) Increasing the number of molecules of the two reactants (increasing concentration) in a given volume of the solution b)

  2. Does temperature affect the rate of reaction between Sodium Thiosulphate and Hydrochloric acid?

    Diagram Method To start off my experiment, I will collect all of our equipment and set it up. I will place the ceramic mats on the table then place the Bunsen on top of one and hook it up to the gas.

  1. How does temperature affect the rate of a chemical reaction?

    However if one set of results is entirely different to the other, a fourth experiment will be produced to replace the anomalous set of results. Two graphs will then be drawn so that my findings are clear; they will show temperature against average time for reaction and temperature against rate of reaction.

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

    things we need to make sure we do to keep it a fair test. Firstly I will keep a chemical at a constant concentration. So in this experiment we have chosen to keep Hydrochloric Acid at a constant concentration (10cm3).

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