Why AC 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.
Why AC is used in conductivity measurement?
Since conductivity is an indicator of how easily current passes through a solution, it is dependent on the quantity of ions and their mobility in that solution. To prevent this, an alternating voltage (AC voltage) is applied when measuring conductivity, commercial power sources of 50 Hz or 60 Hz usually being used.
Why is alternating current used for the measurement of conductance?
Using DC causes polarisation of the electrodes and electrolyte which leads to error in measured conductance values over a period of time. In AC there is no polarisation due to non-continuous flow of current, hence,AC is used.
Which type of current source is used in Conductometry?
CONDUCTOMETRY PART-2: Instrumentation and Conductometry Titration with Question-Answer. Current source :- Alternative current source is used. High frequency alternating current generator is employed.
Why is alternating current used for measuring of an electrolytic solution?
Why is alternating current used for measuring resistance of an electrolytic solution? Answer: Alternating current is used in electrolysis so that concentration of ions in the solution remains constant and exact value of resistance is measured.
Why is DC used instead of AC in electrolysis?
Why is a DC used in electrolysis? Direct current deposits anions in the anode and cations in the cathode. Incase of an alternating current, the current would keep changing directions and would lead to an uneven distributuion of ions in the electrodes.
Why AC is used in determination of resistance of electrolytic cell experimentally?
Alternating current is that current which is used for measuring resistance of an electrolytic solution. It is used so that the concentration of ions in the solution remains constant and constant value of resistance is measured. Thus, alternating current is used in an electrolyte solution.
Can direct current be used for measurement of electrical conductivity of solution if not why 2?
Explanation: If the conductivity of a solid in a laboratory is being measured, then DC may work. In this instance the use of DC will not result in a correct conductivity measurement.
Why is Conductometry important?
Conductometry is used to analyze ionic species and to monitor a chemical reaction by studying the electrolytic conductivity of the reacting species or the resultant products. It has notable applications in analytical chemistry.
What indicator is used in conductometric titration?
Acid-base titrations and redox titrations are often performed in which common indicators are used to locate the end point e.g., methyl orange, phenolphthalein for acid base titrations and starch solutions for iodometric type redox process.
Why electrolysis is not possible in AC?
During electrolysis, the ionization of the electrolyte takes place when the charges move to opposite electrodes from positive and negative electrodes. If we use ac supply then the polarity of the electrodes keeps changing which will affect the electrolysis. Therefore, ac cannot be used in electrolysis.
Why AC current is used in electrolysis?
During electrolysis, the ionization of the electrolyte takes place when the charges move to opposite electrodes from positive and negative electrodes. If we use ac supply then the polarity of the electrodes keeps changing which will affect the electrolysis.
What do you need to know about conductometric titration?
What is Conductometric Titration? “Conductometric titration is a type of titration in which the electrolytic conductivity of the reaction mixture is continuously monitored as one reactant is added.”. In this titration conductometer is used for measuring conductance. This is the reason it does not require any indicator as conductance
Why is the conductance of acetic acid lower in titration?
In the start of titration conductance is low due to very less ionization of acetic acid. As we start adding more base and titration progresses the conductance increases due to presence of CH3COO- and Na+. Presence of H+ in the solution due to buffer action of sodium acetate and acetic acid.
How is the end point of titration determined?
The theory behind this type of titration states that the end-point corresponding to the titration process can be determined by means of conductivity measurement. For a neutralization reaction between an acid and a base, the addition of the base would lower conductivity of the solution initially.
How does the conductance of a solution depend on?
The conductance of the solution (analyte + titrant) depends on following three factors – During titration one of the ions is replaced by the other and these two different ions differ in their ionic conductance as well. So, conductivity of the solution differs during the course of titration.