Miss Tomlinson EXPERIMENT 18B Feb. 17, 2017
Kaede Kawano The Iodine Clock Reaction Block C
Objectives:
- To observe and record the effect of changing the concentration of a reactant on the rate of a reaction
- To observe and record the effect of changing the temperature of a system on the rate of a reaction
- To observe and record the effect of the nature of the reactants on the rate of a reaction
- 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 NaHSO3 (sodium bisulfite)
10 test tubes (18mm x 150mm) (also containing 4g of starch and 12mL of 1M H2SO4/L)
thermometer 0.02M KMnO4 (potassium permanganate)
4 beakers (250mL) 0.1M FeSO4 (Iron(II)sulfate)
2 medicine droppers 0.1M Na2C2O4 (sodium oxalate)
ice 0.1M MnSO4 (manganese(II)sulfate)
6 test tubes (13mm x 100mm) 1M H2SO4
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 |