What is the principle potentiometric titration?
What is the principle potentiometric titration?
Potentiometric Titration Principle. Potentiometric titration is a laboratory method to determine the concentration of a given analyte. It is used in the characterization of acids. In this method, there is no use of a chemical indicator. Instead, the electric potential across the substance is measured.
What is the electrode used in potentiometric titrations?
Calomel and silver/silver-chloride electrodes are commonly used in potentiometric titration. In the case of possible interferences of chlorides (as in determination of halides), a mercurous sulfate electrode may be used. In the following series of experiments a home made Ag/AgCl/1 M KCl reference electrode is used.
What is electrode in potentiometry?
In potentiometry, those two electrodes are generally called the indicator electrode and the reference electrode. Most potentiometric methods employ one of two other common reference half-cells – the saturated calomel electrode (SCE) or the silver-silver chloride electrode (Ag/AgCl).
What is meant by working electrode?
The working electrode is the electrode in an electrochemical system on which the reaction of interest is occurring. Depending on whether the reaction on the electrode is a reduction or an oxidation, the working electrode is called cathodic or anodic, respectively.
Why is potentiometric titration better?
Advantages of potentiometric titration: It is an economical titration method. It requires a small quantity of substances. There is no need to use indicators for potentiometric titration. The titrations results are accurate as no colour indicators are involved.
What is the principle of titration in potentiometry?
Potentiometric Titration principle of Potentiometry Principle When the pair of electrodes are placed in the sample solution or analyte it shows the potential difference between two electrodes by addition of the titrant or by the change in the concentration of ions. The two electrodes are named as reference electrode and indicator electrode.
What are the two electrodes used in titration?
Potentiometric Titration Method Potentiometric Titration is done via the usage of two electrodes – an indicator electrode and a reference electrode (generally a hydrogen electrode or a silver chloride electrode). One half-cell is formed with the indicator electrode and the ions of the analyte, which is generally an electrolyte solution.
What is the difference between EMF and potentiometric titration?
The EMF or potential is measured in millivolts (mV) using a potentiometer having an indicator and reference electrode. In a potentiometric titration, the endpoint is determined by measuring the changes in the potential of the solution. This change in potential is caused due to the addition of titrant.
What is the principle of potentiometry?
The principle behind the potentiometry is that when a pair of electrodes is placed in a solution, the addition of a titrant or a change in the concentration of ions indicates the potential difference. The reference electrode has its potential value and when it is dipped into sample solution it is stable.
