Reaction Kinetics Lab
������ The purpose of this lab is to determine the rate equation for the reaction between starch molecules (C6H12O6)n, sulphite ions (SO3-2), hydronium ions (H3O+) and iodate ions (IO3–).
- Do each of the first five trials in the order shown by adding the reactants in the order shown (water first) to a 600 ml beaker with a magnetic stirrer.� Note that the total volume in each trial is always 400 ml so that by doubling the volume of a particular reactant its concentration is doubled.� By doubling the concentration of a reactant while keeping the other concentrations constant, you can determine the order of the reaction with respect to that reactant.� Important Note:� Make sure that the iodate solution is always the last reactant added to the reaction beaker.�� Begin timing as you add the iodate solution.� (Add the iodate all at once as quickly as possible.)
- After completing the first five trials predict what the reaction times should be for each of the remaining trials.� Then perform those trials and compare your results with your predictions.
|Trial||Volume (ml)||Volume (ml)||Volume (ml)||Volume (ml)||Volume (ml)||Reaction||Predicted|
|Number||of Water||of Starch||of Sulphite||of Acid||of Iodate||Time (sec)||Time (sec)|
- The reaction is ____________ order with respect to starch.
- The reaction is ____________ order with respect to the sulphite ion.
- The reaction is ____________ order with respect to the iodate ion.
- The reaction is ____________ order with respect to the hydronium ion.
- The reaction is ____________ order overall.
- Write the rate equation for the reaction: