Conductometric titration theory states that the end-point of the
titration process is determined by means of measuring conductivity. This
theory is used for colloids that have ionazable functional groups like
latexes. These functional groups are acidic and the theory uses sodium
hydroxide as a titrant. To test conductometric titration theory, add
sodium hydroxide from the burette, then plot the conductivity readings
that correspond to the increments against the titrant's volume.
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Conductometric titration theory can be used for either
turbid or colored liquids in cases when you cannot detect the end-point
by using indicators that are normal. Furthermore, you can use the theory
to find out the end-points of dilute weak acids and solutions. Another
advantage is that you do not need to measure the real conductance value
because you can put into use any amount that is proportional to it.
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The two essential tools used in the conductometric titration
theory include an apparatus for measuring and studying conductivity
changes and a conductivity cell that has dipping electrodes. But if you
are carrying out simple titration using this theory, you will need a
dipping electrode, a mechanical stirrer and a beaker of a suitable size.
You will also require measuring circuits that will assist you in
preventing concentration changes as a result of reactions at the
electrodes.
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Principle of the conductometric titrations theory states
that for dilutions that are infinite, ions act independently and in the
process contribute toward conductance of the solution. The principle
behind this theory states that anions and cations have different
conductance values. Therefore, if you add a solution of one electrode to
another, the final conductance will rely on the occurrence of reaction.
But if there is no chemical reaction in the electrolyte solutions,
there will be an increase in the level of conductance.
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To calculate the end-point of the conductometric titration
method, you should plot the curve of the conductometric titration in the
usual way. Estimate the end-point by plotting two straight lines using
the usual graphical method.
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