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T-8
NOTE:
The reaction solutions that are warmed may be swirled in the air because the
reaction time for these solutions is relatively short. Therefore, the temperature of
the solution will not change significantly during the reaction period.
Run 3 -
Carry out the experiment as in Run 2 using a final temperature that is about 20°C above
room temperature. Water baths set at about 40
C are provided to warm these solutions.
Record the reaction time and the temperature of the reaction solution to ±0.1°C
on your
Observations Sheet.
Run 4 -
Carry out the experiment as in Run 2, however cool the flasks in a cold water bath to about
10
C below room temperature. Keep the temperature of the bath constant by adding ice as
required. Swirl the reaction flask in the cold water bath so the solution does not warm
up. Continuously monitor the temperature of the reaction solution and immerse or
remove the flask from the water bath in order to keep the temperature constant
during the reaction period. Record the reaction time and the maintained temperature of
the reaction solution to ±0.1°C on your Observations Sheet.
Run 5 -
Carry out the experiment as in Run 2, however cool the flasks with an ice water bath to about
20°C below room temperature. Continuously monitor the temperature of the reaction
solution and immerse or remove the flask from the ice bath in order to keep the
temperature constant during the reaction period. Record the reaction time and the
maintained temperature of the reaction solution to ±0.1°C on your Observations Sheet.
II. The Effect of a Catalyst on Reaction Rate and Activation Energy
Prepare solutions as outlined for Run 1 above but do not add EDTA to either container. To the
beaker containing 20.00 mL (NH
4
)2S2O
8
, add 3 drops of 0.10 M CuSO
4
. Mix thoroughly. Carry out
this reaction at room temperature in the same way as you have done in the previous runs. Record this
time in the space for Run 6.
