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Heath's Lab 18b

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Miss Tomlinson                                EXPERIMENT 18B                                Feb. 17, 2017
Kaede Kawano                                
The Iodine Clock Reaction                                   Block C

Objectives:

  1. To observe and record the effect of changing the concentration of a reactant on the rate of a reaction
  2. To observe and record the effect of changing the temperature of a system on the rate of a reaction
  3. To observe and record the effect of the nature of the reactants on the rate of a reaction
  4. To observe and record the effect of a catalyst on the rate of a reaction

Materials:

Apparatus                                        Reagents
2 Beakers (100mL)                                Solution A: 0.02M KIO3 (potassium iodate)        
2 graduated cylinders (10mL)                        Solution B: 0.002M NaHSO
3 (sodium bisulfite)
10 test tubes (18mm x 150mm)                        (also containing 4g of starch and 12mL of 1M H
2SO4/L)
thermometer                                        0.02M KMnO
4 (potassium permanganate)
4 beakers (250mL)                                0.1M FeSO
4 (Iron(II)sulfate)
2 medicine droppers                                0.1M Na
2C2O4 (sodium oxalate)
ice                                                0.1M MnSO
4 (manganese(II)sulfate)
6 test tubes (13mm x 100mm)                        1M H
2SO4
lab apron
safety goggles

Procedure:

Refer to pages 197-203 in Heath Chemistry Laboratory Experiments, Canadian Edition

Diagram:

n/a

Data and Observations:

Part 1: Effect of Concentration

Volume of KIO3(mL)

10.0

9.0

7.0

5.0

3.0

Time for Reaction (s)

9.84

9.25

11.65

16.93

23.16

Part 2: Effect of Temperature

Temperature (°C)

5.0

15.0

25.0

35.0

Time for Reaction(s)

21.53

18.24

13.42

11.34

Part 3: Effect of the Nature of the Reactants

Time for reaction (s)

Fe2++MnO4-+H+

12.31

C2O42-+MnO4-+H+

9.31.72

Part 4: Effect of a Catalyst

Temperature (°C)

Time (s)

Temperature (°C)

Time (s)

With Mn2+ catalyst

Room Temperature

44.4

50.0

12.85

Without Mn2+ catalyst

Room Temperature

544.93

50.0

48.80

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