What is conductometric titration curve?
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. The titration curve can be used to graphically determine the equivalence point.
How do you calculate conductometric titration?
The strength of the acid can now be calculated via the formula S2 = (V1S1)/10; where S2 is the strength of the acid, V1 is the volume of base added (as per the equivalence point on the conductometric titration graph), and S1 is the strength of the base (already known).
How is the accuracy of conductometric titration determined?
It does not require indicators as titration is based on conductance of the solution and end point or neutralization point is determined graphically. It is suitable for colored solutions as well. As the end point is determined graphically, results are more accurate with minimum error.
Why does conductivity decrease in titration?
In a typical conductometric titration of strong acid with a strong base the conductivity first decreases because the hydrogen ion of the acid is exchanged by the cation of the base. In that molecule the protons and hydroxide ions are not available as mobile ions so this is the reason for the conductivity to stay low.
What is the basic principle of conductometric titration?
The principle of conductometric titration is based on the fact that during the titration, one of the ions is replaced by the other and invariably these two ions differ in the ionic conductivity with the result that conductivity of the solution varies during the course of titration.
What is the difference between volumetric and conductometric titration?
Volumetric titration does not give correct endpoint for polybasic acids, while conductometric titration can be conveniently used in such cases. Conductometric titration can be used where there is no appropriate pointer.
What is the difference between conductometric titration and normal titration?
The key difference between potentiometric and conductometric titrations is that potentiometric titrations measure the potential across the analyte, whereas conductometric titrations measure the electrolytic conductivity of the analyte. From this titrant, we can determine the concentration of an unknown solution.
Why does the decrease of conductance is sharper than the increase in conductance during strong acid base HCl and Naoh conductometric titration?
When we add a small amount of base to the acid, keeping the HCl(aq) in excess, the solution contains Cl-(aq), Na+(aq), but, there will be a decreased number of highly mobile H+(aq). Because the concentration of highly mobile H+(aq) has decreased, the conductance of the solution decreases.
How does temperature affect conductometric titration?
Answer: Even if both Re(Z) and Im(Z) increases with temperature, the end-point of a conductometric titration is not affected by temperature [45, 46] , since the critical volume of added titrant is determined by changes and not absolute values of the measured electrical conductance.
Why AC current is used in conductometric titration?
Since in AC current, equal current flows in both directions over a given amount of time(larger enough than time period), reaction takes place in both the directions. On an average, no chemical change in composition would be observed.
Which is better conductometric or volumetric?
More accurate results are obtained by conductometric titrations because the end-point is determined graphically from a number of measurements and not from a single measurement as in volumetric titration. This titration can be used with colored or opaque solutions in which endpoint cannot be seen by the naked eye.
What is the equivalence point In conductometric titration?
This is due to the binding of H+ions of acid with the OH- of Base until a point is reached where conductance is minimum. When we move forward the conductance starts increasing again. This is now due to the free ions of Base present in solution. This point at which this transition occurs is called Equivalence point.
How are conductometric titrations used in redox systems?
Application of conductometric titrations to redox systems is limited because, high concentrations of hydronium ions in the solution tends to mask the changes in conductance 29. Applications : 1. Check water pollution in rivers and lakes 2. Alkalinity of fresh water 3. Salinity of sea water (oceanography) 4.
What are the different types of acid base titrations?
We will consider the following types of acid-base conductometric titrations: Strong acid and strong base conductometric titration Strong acid and weak base conducotmetric titration ; Weak acid and strong base conductometric titration ; Weak acid and weak base conductometric titration
What happens to the conductivity of an acid base titration?
During an acid-base titration there will be changes in the conductivity of the solution reflecting the changing concentration of ions in solution, especially the changes in the concentration of highly mobile ions like H +(aq) and OH -(aq) . There are different ways to measure the electrical conductivity of a solution. (6)
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