IODINATION OF ACETONE

CHEMISTRY LAB REPORT

JANUARY 13 th , 2010

LAB PERFORMED BY:

Narendran Sairam and Steven Kraplin and Daniel Glukhov

Table of Contents1. Title Page........................................................................................................................................1

2. Table of Contents...........................................................................................................................2

3. Objective........................................................................................................................................3

4. Equipment......................................................................................................................................3

5. Experimental Procedure.................................................................................................................4

6. Data Tables.....................................................................................................................................5

7. Caculations.....................................................................................................................................5

8. Predictions......................................................................................................................................6

9. Conclusion.....................................................................................................................................6

Objective:

The objective of this lab is to determine the rate of the iodination of acetone by differing the

amounts of reactants, finding the rate constant (k) and the order of the reaction in terms of each of the

reactants.

Equipment: gloves

safety glasses

thermometer (manufactured by Control Company serial no: 61161-283)

two testubes

100 mL of 4M Acetone

100 mL of 1M HCl

100mL of 0.005 M I2

graduated cylinder

125 mL Erlenmeyer flask

distilled water

Experimental Procedure:

1. Prepare for lab by obtaining all the necessary materials in the equipment list.

2. Obtain 10 mL of 4M Acetone, 10 mL of 1M HCl, 20 mL of distilled water and 10 mL of

0.005mL 0.005 M I2.

3. Add the acetone, 1M HCl and water to a 125 mL Erlenmeyer flask and then quickly add the

0.005 M I2 and begin timing.

4. Swirl the mixture until the color disappears completely and the mixture is clear and comparable

to distilled water in another flask of the same type.

5. Record the time taken for the mixture to get to this state.

6. Record the temperature of the final mixture.

7. Repeat steps 2-6 and record data for the second run.

8. Obtain 20 mL of 4M Acetone, 10 mL of 1M HCl, 10 mL of distilled water and 10 mL of

0.005mL 0.005 M I2.

9. Repeat steps 3-6.

10. Repeat steps 8 and 9 and record data for the second run.

11. Obtain 10 mL of 4M Acetone, 20 mL of 1M HCl, 10 mL of distilled water and 10 mL of

0.005mL 0.005 M I2.

12. Repeat steps 3-6.

13. Repeat steps 11 and 12 and record data for the second run.

14. Obtain 10 mL of 4M Acetone, 10 mL of 1M HCl, 10 mL of distilled water and 20 mL of

0.005mL 0.005 M I2.

15. Repeat steps 3-6.

16. Repeat steps 14 and 15 and record data for the second run.

17. Check that you have the times and the temperatures for all the runs.

Data Table:

Mixture Volume of Acetone

(mL)

Volume of 1M HCl

(mL)

Volume of 0.005 M I2 (mL)

Volume of distilled water (mL)

Run time in seconds

Run time in seconds

Temperature in degrees

Celsius

I 10 10 10 20 175 190 20.45

II 20 10 10 10 79 64 21.1

III 10 20 10 10 135 104 19.5

IV 10 10 20 10 335 350 20.5

Mixture Acetone (M)

[H + ] (M)

[I2 ]o

(M)Rate=

[I2 ]o/average time(s -1 )

I 0.80 0.20 0.0010 5.4794 x 10-6

II 1.60 0.20 0.0010 1.3986 x 10-5

III 0.80 0.40 0.0010 9.5693 x 10-6

IV 0.80 0.20 0.0020 5.8394 x 10-6

Calculations:rate of reaction = k[acetone]m [H+]n [I2 ]p

(Rate II) / (Rate I) = 2m = 2.55244◦ m=1.35188

(Rate III) / (Rate I) = 2n = 1.7477◦ n=0.09793

(Rate IV) / (Rate I) = 2p = 0.9689◦ p=0.80439

Average Rate: obtained by plugging the values into the rate equation.

K I II III IV Average

k 5.09769117x 10-5 0.097696104x 10-5 5.097696103x 10-5 5.09769103x 10-5 5.09769487 x 10-5

Prediction: a trial experiment based on the data gathered and the values determined. The amounts of

reactants are randomly assumed. There is no specific reason for picking the numbers that were picked.

amount 4M Acetone: 100 mL

amount 1M HCl : 200 mL

amount 0.005M I2: 300mL

amount distilled water: 400 mL

Initial concentration of Acetone: 4M

Initial concentration of HCl: 1M

Initial concentration of I2: 0.005M

rate of reaction = k[acetone]m [H+]n [I2 ]p = 4.681141 x 10-6 seconds

Rate = [I2 ]o/average time= 1068.11 seconds -1

Conclusion:

I believe that this experiment has not met the expectations because the reaction rate that was

obtained through calculations did not correspond to the result provided by the instructor. This may be

for several reasons. For one, the temperatures of the runs varied and this inconsistency in temperature

affects the rate constant, k. also there may have a decent amount of human error involved in, for

example, measuring out the necessary quantity of reactants, miscalculating something or

misinterpreting the instructions provided. In light of these discrepancies, the obtained results are

justified in the fullest.