This assumption will be further evaluated in the evaluation of the weaknesses and limitations. Some of the tubes may have gotten more stirred than others and this would have caused an inaccuracy in the times that were collected. It also makes a useful starting-point for a student investigation. It is assumed that the order of reaction with respect to the bisulfate is zero, thus n is zero. In this lab, double replacement reactions between compounds were done in order to determine the equation and description of a new substance
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. Some of the tubes may have gotten more stirred than others and this would have caused an inaccuracy in the times that were collected.
The Iodine Clock Investigation
All throughout the lab the assumption that is made throughout the lab is that the bisulfate ion has a reaction dlock of zero. The order of reaction with respect to the iodate ion, mmust be determined for the following rate.
Solution A Note 1: The final rate law determined was:. Answers Clock Iodine lab Reaction. It also makes a useful starting-point for a student investigation. Page last updated October Scaling up the volumes of solution that are mixed may help in a large room.
Iodine Clock Reaction Lab Answers
A solution of hydrogen peroxide is mixed with one containing iodins iodide, starch and sodium thiosulfate. In part B the activation energy was found to be 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. Iocine of the iodate ion concentration being changed the concentration of the bisulfate exleriment have been changed by making it the limiting reactant in the balanced equations.
Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Stir until all the solids have dissolved and allow to cool to room temperature.
Description A solution of hydrogen peroxide is mixed with one containing potassium iodide, starch and sodium thiosulfate.
Iodine Clock Reaction Lab Answers – SchoolWorkHelper
The solutions will keep overnight, but best results expwriment obtained if the solutions are made up on the day. This is one of a number of reactions loosely called the iodine clock.
In search of more solutions: 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 reaction Experiment. Teaching notes Visual tips: Sodium thiosulfatewater, Na 2 S 2 O 3.
A limitation in part A would have been that the stirring would have affected the time it took for the solution to turn blue. Iodine Clock Reaction Lab Answers. Eye protection Balance coureework or 2 d. See Technician notes about using dilute ethanoic acid as a less hazardous alternative.
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: