DCP and CE Rate Propanone

Lab Report: Chemistry
DCP + CE

Jovi Arya
28 August 2012

Aim
The aim of this lab is to determine the order of the reaction between Propanone and aqueous Iodine with respect to Iodine.

Apparatus and Reagents
Apparatus
I. Eye Protection (1)
II. Spectrophotometer
III. Cuvettes for spectrophotometer
IV. Burette (4)
V. Burette Stand (4)
VI. Stopwatch
VII. Conical flask (2)
Reagents
I. 0.020M I­2 (aq.)
II. 2.0M CH­3COCH3 (aq.)
III. 2.0M HCl (aq.)

Raw Data
Absorbance of I2 Solution
Volume of I2 Solution/ cm3 ± 0.1
Volume of distilled water/ cm3 ± 0.05
[ I2 (aq.)]/ mol dm-3±0.0005
Absorbance ± 0.001
0.0
10.00
0.0000
0.000
1.0
9.00
0.0020
0.097
2.0
8.00
0.0040
0.175
3.0
7.00
0.0060
0.261
4.0
6.00
0.0080
0.356
5.0
5.00
0.0100
0.440

The difference in color was evident even to the naked eye – lower concentrations of I2 had a yellowish color akin to lemonade, while the higher concentrations tended towards a brownish-yellow.
Quantities of Reagents

Experiment

1
2
3
Volume of 2M Propanone/cm3±0.05
2.00
2.00
2.00
Volume of 0.02M I2/cm3 ± 0.05
4.00
1.00
2.00
Volume of 2M HCl/cm3 ± 0.05
2.00
2.00
2.00
Volume of H2O/ cm3 ± 0.05
2.00
5.00
4.00
Propanone/ mol dm-3 ± 0.05
0.40
0.40
0.40
I2/ mol dm-3 ± 0.0005
0.0088
0.0020
0.0040
H+/ mol dm-3 ± 0.05
0.40
0.40
0.40

Reaction between I2 and CH3COCH3
Experiment
Absorbance at t minutes ± 0.001

0.5
1.0
1.5
2.0
2.5
3.0
1
0.499
0.480
0.457
0.435
0.415
0.397
2
0.028
0.006
0.005
0.005
0.005
0.005
3
0.138
0.118
0.096
0.077
0.055
0.039

Data Processing
Creation of Standard Calibration curve
By plotting Concentration of I2on the x-axis and Absorbance on the y-axis, a standard calibration curve for Iodine in solution can be created.

The margin of error in absorbance calculations is4.1% + 0.7% (from the graph) or 4.8%
Calculation of concentration during reactions

Using

Cited: Ramsden, E.N. A-Level Chemistry. 4th ed. Nelson Thornes, 2000.