IODINE CLOCK EXPERIMENT COURSEWORK

Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Schoolworkhelper Editorial Team https: Also some solutions turned blue right away and others took a while so they could be seen by the human eye. Our new website is coming soon. A limitation in part A would have been that the stirring would have affected the time it took for the solution to turn blue.

Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Lastly a limitation in part B is that a final temperature for the solution could not be measured because of all of the surrounding influences such as holding the tube would have transferred heat to the solution. As soon as the iodine is formed, it reacts with the thiosulfate to form tetrathionate ions and recycles the iodide ions by the fast reaction: The effect of concentration and temperature on reaction rate. Another relationship that can be seen between the rate constant and the temperature is that as the temperature increased the rate constant increased as well.

iodine clock experiment coursework

In search of more solutions: Scaling up the volumes of solution that are mixed may help in a large room. In part B the activation energy was found to be The demonstration f Measure cm 3 of solution A and cm 3 of solution B in separate cm 3 measuring cylinders.

In conclusion, from part A the order of reaction of the iodate was found courswork be 2. Additional notes 1 Hydrogen peroxide is capable of oxidising thiosulfate ions to tetrathionate ions but the reaction is too slow to affect this demonstration.

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The Iodine Clock Investigation – GCSE Science – Marked by

Solution B is made up as follows: Our new website is coming soon. Sodium thiosulfatewater, Na 2 S 2 O 3.

iodine clock experiment coursework

Eye protection Balance 1 or 2 d. This is one of a number of reactions loosely called the iodine clock. Conclusions that can be drawn from the data is that when the concentration of the potassium iodate clokc was increased the rate of reaction decreased. Jump to main content.

As well another way that the procedure can be improved upon is to perform the lab like a titration lab using a burette, flask and the courrsework. The experiment should have been done both ways to have the most accurate results.

The Iodine Clock Investigation

Page last updated October Some of the tubes may have gotten more stirred than others and this would have caused an inaccuracy in the times that were collected. Pour onto this approximately cm 3 of boiling water and stir. A chemical stop-clock – iodine clock reaction Rates and rhubarb.

iodine clock experiment coursework

A limitation in part A would have been that the stirring would have affected the time it took for the solution to turn blue. A solution of hydrogen peroxide is mixed with one containing potassium iodide, starch and sodium thiosulfate. Courrsework relationship that can be seen between the rate constant and the temperature is that as coursewor, temperature increased the rate constant increased as well.

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If the demonstration is being done for entertainment, the imaginative teacher will be able to think up some suitable patter. In this lab, double replacement reactions between compounds were done in order to determine the equation and description of a new substance Lesson organisation This demonstration can be used at secondary level as an introduction to some of the ideas about kinetics.

This collection of over practical activities demonstrates a wide range of chemical concepts and processes. A solution of hydrogen peroxide is mixed with one containing potassium iodidestarch and sodium thiosulfate.

Also, when the tube was taken out the bath tub the room temperature immediately affected it, constantly changing the final reaction. There is no warning of when the blue colour is about to appear.

Iodine Clock Reaction Lab Answers – SchoolWorkHelper

It is assumed that the order of reaction with respect to the bisulfate is zero, thus n is zero. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures.

A Future in Chemistry. Also some solutions turned blue right away and others took a while so they could be seen by the human eye. To avoid this the acid and sodium thiosulfate are separated in solutions Experment and B.