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Spectrophotometry
Spectrophotometer CCD 2
Ref : 701 606
Choose « absorption » or « transmittance » as a function of the variable to follow and enter
one to two wavelengths to follow with time.
Note it may be necessary to follow two wavelengths if one the products corresponding to
a wavelength is one the reagents of another.
Acquisition example:
The ½ reaction time (implying a given reagent) is the period of time for which the
concentration of this reagent would have been halved, it will be noted t
write:
In order to determine t
finally, t1/2 following the vertical line passing through the curve and which ordinate is x
To go further, use the modelling tools in the Display/Modelling.
Experiments in the presence of gas in the solutions don't allow a study in a situation of
stable light intensity over time. In fact, the optical path is modified by the presence of
bubbles. We therefore advise you not to conduct experiments such as: H
ENGLISH
Example of kinetics obtained for two different wavelengths.
x(t
)=1/2.x
1/2
in the case of a total reaction, determine x
1/2
23
1/2
final
then x
final
O
2
. We can then
/2 and
final
/2.
final
+ KI.
2
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