Chemistry Lab Report Experiment 4 Kinetics: The Iodine Clock

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Chemistry Lab Report

Experiment 4

Kinetics: The Iodine Clock

14 March 2013

Decan Dana Younis

Helin Nahro Said

San Hawdang Mahmud

Ms. Mariam Merry

I. Purpose:

The purpose of this experiment is to measure the reaction rates of the different given

concentrations of reactants or products in the beginning and at the end of an amount of

time.

II. Chemicals and Supplies:

Chemicals:

Supplies:

- Ammonium peroxydisulfate, (NH

)

- Sodium thiosulfate, Na

- Potassium iodide, KI

- Starch

- 250 mL Volumetric flask

- 2 100 mL Volumetric flasks

- 25 mL Volumetric flask

- 4 50 mL graduated cylinders

- 2 250 mL Erlenmeyer flasks

- 600 mL Beaker

- 2 Stopwatches

III. Procedure:

part of the experiment:

In order to do the experiment, you have to do these calculations to get the mass of the

chemicals. Then, you can start with the experiment.

1. 0.20 M KI in 250 mL Volumetric flask.

2 0.050 M (NH

)

in 100 mL Volumetric flask.

3 0.00175 M Na

in 100 mL Volumetric flask.

4 3% w/v Starch solution in 25 mL Volumetric flask.

part of the experiment:

For this part, you have to find the reactants' order and the rate constant.

1. To combine the reagents, use a clean 250 mL Erlenmeyer flask each time for the first 6

runs in the table 1. But, be aware to wash the Erlenmeyer flask after you finish each run.

2. Write the names of the chemicals on each of the 4 graduated cylinders. Use these

graduated cylinders to measure each reagent.

3. Add the reagents together in the Erlenmeyer flask in for each run but then in the order of

mentioning them in the table 1.

4. When you add the (NH

)

, start with measuring the time with the stopwatch, and stop

the time when the color of the solution changes.

5. Record the time in the table 1.

6. Wash every single supply that you used.

7. Put the supplies on the table neatly.

IV. Observation:

Quantitative data:

Qualitative data:

- 1.14g , 0.050M (NH

)

- 0.0289g , 0.00175M Na

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Chemistry Lab Report Experiment 4 Kinetics: The Iodine Clock 14 March 2013 Decan Dana Younis Helin Nahro Said San Hawdang Mahmud Ms. Mariam Merry I. Purpose: The purpose of this experiment is to measure the reaction rates of the different given concentrations of reactants or products in the beginning and at the end of an amount of time. II. Chemicals and Supplies: Chemicals: Supplies: - Ammonium peroxydisulfate, (NH4)2S2O8 - Sodium thiosulfate, Na2S2O3 - Potassium iodide, KI - Starch 250 mL Volumetric flask 2 100 mL Volumetric flasks 25 mL Volumetric flask 4 50 mL graduated cylinders 2 250 mL Erlenmeyer flasks 600 mL Beaker 2 Stopwatches III. Procedure: 1st part of the experiment: In order to do the experiment, you have to do these calculations to get the mass of the chemicals. Then, you can start with the experiment. 1. 0.20 M KI in 250 mL Volumetric flask. 2 0.050 M (NH4)2S2O8 in 100 mL Volumetric flask. 3 0.00175 M Na2S2O3 in 100 mL Volumetric flask. 4 3% w/v Starch solution in 25 mL Volumetric flask. 2nd part of the experiment: For this part, you have to find the reactants' order and the rate constant. 1. To combine the reagents, use a ...
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