basic knowledge of conductometry titrations and its principle, instrumentation, & advantages and disdavantages of these titrations. According to Wikipedia: “Conductometric titration is a type of titration in which the electrolytic conductivity of the reaction mixture is continuously. 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.

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Views Read Edit View history. Furthermore, you can use the theory to find out the wi,ipedia of dilute weak acids and solutions. In this case there is no limit of dilution below which the relationship between conductivity and concentration becomes linear. Shedlovsky [16]E.

Conductometric Titration Theory

Archived from the original PDF on 12 September Whether this constitutes ion association is a moot point. Fuoss [18]Fuoss and Shedlovsky [19]Fuoss and Onsager [20].

Textbook of Physical Chemistry. To calculate the end-point of the conductometric titration method, you should plot the curve of the conductometric titration in the usual way. Instead, the solution becomes ever more fully dissociated at weaker concentrations, and for low concentrations of “well behaved” weak electrolytes, condjctometric degree of dissociation of the weak electrolyte becomes proportional to the inverse square root of the concentration.

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It is very successful for solutions at low concentration. The concentration of ions in a solution of a weak electrolyte is less than the concentration of the electrolyte itself. The conductometric titration curve is a plot of the measured conductance or conductivity values as a function of the volume of the NaOH solution added.


By using this site, you agree to the Terms of Use and Privacy Policy. Environmental Instrumentation and Analysis Handbook. Typical weak electrolytes are weak acids and weak bases. Conductomrtric wide variety of instrumentation is commercially available. Conductometric titration theory states that the end-point of the titration process is determined by means of measuring conductivity.

Conductivity or specific conductance of an electrolyte solution is a measure of its ability to conduct electricity. As the titration progresses, the protons are neutralized to form water by the addition of NaOH. Then conductivity increases slightly up to the equivalence point volume, due to contribution of the salt cation and anion.

The change in conductivity due to the isotope effect for deuterated electrolytes is sizable. Conductometry has notable application in analytical chemistrywhere conductometric titration is a standard technique. The conductivity of a solution of a strong electrolyte at low concentration conducyometric Kohlrausch’s Law.

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Moreover, Kohlrausch also conductomeyric that the limiting conductivity of an electrolyte. Thus the electrolyte is treated as if it were titratioh a weak acid and a constant, Kcan be derived for the equilibrium. In usual analytical chemistry practice, the term conductometry is used as a synonym of conductometric titrationwhile the term conductimetry is used to describe non-titrative applications.


Please help improve this article by adding citations to reliable sources. From Wikipedia, the free encyclopedia. For a monoprotic acidHA, obeying the inverse square root law, with a dissociation constant K aan explicit expression for the conductivity as a function of concentration, cknown as Ostwald’s dilution lawcan be obtained. Limiting here means “at the limit of the infinite dilution”.

The conversion of conductivity to the total dissolved qikipedia depends on the chemical composition of the sample and can vary between 0. High quality deionized water has a conductivity of about 5.

The reason for this is that as concentration increases the average distance between cation and anion decreases, so that there is more inter-ionic interaction. In effect, the observed conductivity of a strong electrolyte becomes directly proportional to concentration, at sufficiently low concentrations i.

By using this site, you agree to the Terms of Use and Privacy Policy. Retrieved 17 May This minimum can be used, instead of an indicator dye, to determine the endpoint of the titration.

Journal of the American Chemical Society.

Retrieved from ” https: The limiting equivalent conductivity of solutions based on mixed solvents like water alcohol has minima depending on the vonductometric of alcohol. Dilute solutions follow Kohlrausch’s Laws of concentration dependence and additivity of ionic contributions.