Chemical Reaction Of Chemical Reactions

2120 Words Jun 9th, 2016 9 Pages
Chemical kinetics is the study of rates during chemical processes and the speed at which they occur (Chm.Davidson, 2016). Chemical kinetics can be altered by the effect of various variables and the re-arrangement of atoms. An example of kinetic processes can be seen in many experiments such as the ‘Landolt Iodine Clock Reaction.’

Clock reactions represent chemical reactions in which two colourless solutions are mixed together; at first no reaction takes place but after a short period of time the solution can be seen to undergo a change in colour. Within the Landolt iodine clock reaction Potassium Iodate and Sodium Bisulphite react to yield iodine, which in return reacts with the starch molecules to form the blue solution (RSC, 2016). The process of this experiment can be explained through the following chemical reactions:

The iodine ions are produced, due to following reaction between iodate and bisulphite:

IO3− + 3 HSO3− → I− + 3 HSO4−
2. The iodate that is left in excess after the first reaction will oxidise with iodide formed to generate iodine:
IO3− + 5 I− + 6 H+ → 3 I2 + 3 H2O
3. Instantaneously the iodine is reduced back to iodide by the bisulphite I2 + HSO3− + H2O → 2 I− + HSO4− + 2 H+
Consequently the iodine will react with the starch to create the coloured solution; this will only occur once the bisulphite is fully consumed (Unomaha, 2016). Throughout the course of these chemical reactions, the rate at which the reaction occurs takes place…
Open Document