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Lecture 3

CHM110H5 Lecture Notes - Lecture 3: Analytical Chemistry, Titration, Analyte

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Judith C Poe

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Why is it important to remove the CO2 from the solutions before doing the titration?
The only reason you want to remove CO2 from acid base titrations is that CO2 will form
carbonic acid which will take up some base to neutralize and thus giving you wrong values.
However, there is no need to do this routinely if you are also running a blank titration along with
your sample one. It will negate the effects of carbonic acid formed
It is important to remove the carbon dioxide from the solution before doing the titration because,
carbon dioxide mixed with water is acidic, and it produces an acid.
The analytical technique in this experiment is referred to as “back titration.” Define this
Back titration is an analytical chemistry technique which allows the user to find the
concentration of a reactant of unknown concentration by reacting it with an excess volume of
another reactant of known concentration. The resulting mixture is then titrated back, taking into
account the molarity of the excess which was added. Back titrations can be used for many
reasons, including: when the sample is not soluble in water, when the sample contains impurities
that interfere with forward titration, or when the end-point is more easily identified than in
forward titration.
A titration method where the concentration of an analyte is determined by reacting it with a
known amount of excess reagent. The remaining excess reagent is then titrated with another
second reagent. The second titration's results show how much of the excess reagent was used in
the first titration and the original analyte's concentration can then be calculated.
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