IODINE CLOCK EXPERIMENT COURSEWORK

A solution of hydrogen peroxide is mixed with one containing potassium iodide , starch and sodium thiosulfate. It can be used to stimulate discussion about what factors affect the rate of reaction. Scaling up the volumes of solution that are mixed may help in a large room. See Technician notes about using dilute ethanoic acid as a less hazardous alternative. Stir until all the solids have dissolved and allow to cool to room temperature. A Future in Chemistry. Apparatus Chemicals Eye protection Balance 1 or 2 d.

Please help us feed and educate children by uploading your old homework! Iodine clock reaction Experiment. 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. Instead of the iodate ion concentration being changed the concentration of the bisulfate could have been changed by making it the limiting reactant in the balanced equations. Solids, liquids and gases.

The order of reaction with respect to the iodate ion, mmust be determined for the following rate.

iodine clock experiment coursework

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: Procedure Solution A is made up as follows: Scaling up the volumes of solution that are mixed may help in a large room.

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 indicator. A solution of hydrogen peroxide is mixed with one containing potassium iodide, starch and sodium thiosulfate. See Ikdine notes about using dilute ethanoic acid as a less hazardous alternative Both solutions are colourless although solution A will be slightly cloudy.

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Instead of the iodate ion concentration being changed the concentration of the bisulfate could have been changed by making it the limiting reactant in the balanced equations.

The Iodine Clock Investigation

Jump to main content. 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.

Our new website is coming soon. For a student investigation, the quantities required would be smaller but volumes then need to be measured quite accurately with, for example, disposable plastic syringes. It can be used to stimulate discussion about what factors affect the rate of reaction.

It is assumed that the order of reaction with respect to the bisulfate is zero, thus n is zero. Solution B is made up as follows: A Future in Chemistry.

As soon as all the thiosulfate is used up, free iodine or, strictly, I 3 – ions remains in solution and reacts with the starch to form the familiar blue-black complex. This demonstration can be used at secondary level as an introduction to some of the ideas about kinetics.

iodine clock experiment coursework

The solutions will keep overnight, but best results are obtained if the solutions are made up on the day. Iodine clock reaction Experiment. Both solutions are colourless although solution A will be slightly cloudy.

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Iodine Clock Reaction Lab Answers

In this lab, double replacement reactions between compounds were done in order to determine the equation and description of a new substance If the demonstration is being done for entertainment, the imaginative teacher will ipdine able to think up some suitable patter.

Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Sodium thiosulfatewater, Na 2 S 2 O 3. Xoursework search of more solutions: Solution A is made up as follows: Solution A Note 1: You do not have JavaScript enabled.

Some of the tubes may have gotten more stirred than others and this would have caused an inaccuracy in the times that were collected.

Iodine clock reaction- Learn Chemistry

The basic reaction is: Ensure thorough mixing with a stirring rod or magnetic stirrer. Eye protection Balance 1 or 2 d.

iodine clock experiment coursework

To avoid this the acid and sodium thiosulfate are separated in solutions A and B. Also because the assumption was made that the reaction order of the bisulfate was zero because it was constant throughout may have affected the results as well. Answers Clock Iodine lab Reaction.