Kinetics

1
Kinetics
General Chemistry 101/102Laboratory
ManualUniversity of North Carolina at Wilmington
2
Kinetics
3
Kinetics

• Background

• The chemical reaction being studied in this
  experiment is

6 I- BrO3- 6 H 3 I2
Br - 3 H2O
bromate ion

• By measuring the rate of the reaction as we vary
  the concentrations of I-, BrO3-, and H, we can
  determine the values of x, y, and z.

4
Kinetics

• Background

• Since BrO3- is colorless, we need some way to
  determine when a certain amount of BrO3- has
  reacted.

5
Kinetics

• Background

• The concentration of S2O32- in each trial is
  2.0x10-4 M. Since there are 6 moles of S2O32-
  reacted for every 1 mole of BrO3- reacted, then
  the concentration of BrO3- reacted in each trial
  is 3.3x10-5 M.

6
Kinetics

• Procedure

• Each trial is performed in the same manner. Use
  a 10 mL graduated cylinder to measure the
  quantities shown in Table 1 for Trial 1 into
  flasks labeled A and B.

7
Kinetics

• Procedure

• Add 4 drops of starch solution to the flask
  labeled B.