Why order of reaction is independant of concentration of iodine in experiment of iodination of acetone?
Answers
1- A spectrometer was used to observe the iodine. The spectrometer was set at a wavelength of 410 nm and it was then calibrated using a cuvet filled with water.
2- For water, we set it at 100% transmission and 0% absorbance due to it being colorless, and for the dark colored solution of iodine, it was 100% absorbance, 0% transmission.
B- Preparing the solutions.
1- Six reactions were carried through, each one using a different amount of reactants. The amount of each reactant to be used was given to us in a table for each of the six trials.
2- The table that we were given for the amount of each reactant is below. This is table 1.
Reaction Number 4.0 M Acetone(mL) 1.0M HCl (mL) Water(mL) 0.0050M Iodine (mL)
1 3 3
8
4
2 6 3
5
4
3 9 3
2
4
4 3 6
5
4
5 3 9
2
4
6 3 3
4
8
Table 1. Amount of reactants to be used in each trial
3- After the reactants are mixed, they need to be placed in the cuvet and into the spectrometer as fast as possible. A graduated pipette should be used for the iodine solution and a different one for the rest of the reactants. After pipetting acetone, the pipette should be rinsed with HCl before pipetting the HCl, and the same goes for water.