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

Using the iodine clock method to find the order of a reaction.

Extracts from this document...

Introduction

Using the iodine clock method to find the order of a reaction. Requirements: * 0-110 thermometer * boiling tubes (5) * test-tubes * burettes (or graduated pipettes 1cm , 2cm and 5cm ) * potassium iodide solution, 1.00 mol dm (15cm ) * potassium peroxodisulphate(VI) (K S O ) solution, 0.0400 mol dm (10cm ) * sodium thiosulphate (Na S O ) solution, 0.0100 mol dm (10cm ) * freshly made starch solution (5cm ) * stopwatch Introduction: This reaction takes place when peroxodisulphate(VI) ions and iodide ions react together in solution to form sulphate(VI) ions and iodine. Here is a clear view of the balanced equation representing this reaction; S O (aq) ...read more.

Middle

In this experiment I will be using this clock method in order to find out how the reaction rate depends on the concentration of iodide ions in the reaction mixture. You may find it useful to plot your results on a graph via computer, but I have learnt that it's a much better idea to draw graphs by hand, as computers can't always include all the vital information. Method: 1: Firstly I made up the reaction mixture no.1 from the table below, and measured how long it took for the blue-black iodine-starch colour to appear. I then continued this with the other mixtures in the table, which only differ in the concentration of iodide ions, the water is added to keep the volume at a constant. ...read more.

Conclusion

Time 1 1.08 2 1.03 3 1.53 4 3.18 5 8.04 Finding the order of reaction: Using the results above I can now perform the calculations. To find the order of the reaction with respect to iodide ions, I will have to know how the initial rate of the reaction varies with iodide ion concentration. In order to do this I will have to do the following; * Work out the amount of I produced before the blue-black colour appears. * Use this amount of I and the clock time to work out the initial rate of reaction for each mixture. * Plot a graph of the initial rate of reaction against [I ]. * Use the graph to determine the order of the reaction with respect to I ions. ...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. Rates of Reaction - The Iodine Clock

    The order with respect to a particular reagent is known as a singular order, however, the overall order of a reaction is found by adding together all the singular order involved. E.g. In the reaction A + B --> C Doubling the concentration of reactant A doubles the rate ?First order w.r.t.

  2. The Iodine Clock Investigation

    When the rate expression shows the reaction to be dependant on the concentration of one reactant raised to the power two, it is said to have second order kinetics. The following graphs show results typical to second order reactions: The final graph showing concentration vs.

  1. A-Level Investigation - Rates of Reaction – The Iodine Clock

    the presence of oxygen), it is therefore necessary to use freshly made KI solution. Fresh distilled water should also be available in wash bottles and as a large quantity in a tank. The starch solution should be kept in a fridge as it can provide an excellent medium for bacterial growth.

  2. Activity of Diastase On Starch

    With a typical amylase, therefore as you increase the temperature to the optimum, the rate at which an enzyme catalyses the breakdown of starch increases. The first reason for this is because you increase the rate at which the enzyme and the starch substrate collide (faster Brownian motion).

  1. Investigating the Factors Affecting the Rate of Reaction for the Iodine Clock

    To do this I am using a burette to measure volumes. I chose this method because it will be more accurate than using measuring cylinders where the amounts could easily be measured incorrectly. I am investigating the concentration and how the concentration affects the reaction rates.

  2. The Iodine Clock

    When carrying out the preliminary investigation we found that the only cross that would disappear in the allowed amount of time was a florescent yellow cross; out of the possible blue, pink & yellow crosses. During the preliminary investigation, we tested out which was the best way to collect the reactants with was.

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