Which Electrode Is Used In Potentiometer?

What is a potentiometer in chemistry?

In chemical analysis: Potentiometry.

This is the method in which the potential between two electrodes is measured while the electric current (usually nearly zero) between the electrodes is controlled.

In the most common forms of potentiometry, two different types of electrodes are used..

What is measured in potentiometric titration?

Potentiometry is the method to find the concentration of solute in a given solution by measuring the potential between two electrodes. As the name suggests potentiometric titration involves the measurement of the potential of indicator electrode and reference electrode.

Why do we need reference electrode?

Reference electrode allows you to measure the potential of the working electrode with out passing current through it while counter (auxiliary) electrode allows you to pass current.

What are the types of potentiometry?

Types of potentiometric titration: acid-base titration (total alkalinity and total acidity), redox titration (HI/HY and cerate), precipitation titration (halides), and complexometric titration (free EDTA and Antical #5).

What is the formula of potentiometer?

It is calculated as V/L, where V is the potential difference between two points and L is the distance between two points. Also K = (IρL/A)/L = Iρ/A. E1/E2 = L1/L2 is the equation to compare the emf of two cells, where E1 and E2 are the emf and L1 and L2 are the length at which it is balanced.

Why potentiometric titration is used?

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 are the applications of potentiometry?

ISEs are also regularly used in environmental analysis, such as in a water treatment plant to monitor nitrate levels. The instrumentation used to perform potentiometry is straightforward, consisting of an indicator electrode, a reference electrode, and a potential measuring device.

What is reference electrode give example?

It is an electrode whose potential is arbitrarily taken as zero or is exactly known. Standard Hydrogen Electrode (SHE), calomel electrode, silver-silver chloride electrode and glass electrode are some examples of reference electrode.

What is meant by reference electrode?

A reference electrode is an electrode which has a stable and well-known electrode potential. … There are many ways reference electrodes are used. The simplest is when the reference electrode is used as a half-cell to build an electrochemical cell. This allows the potential of the other half cell to be determined.

What is the difference between conductometric and potentiometric titrations?

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.

What is a DC potentiometer?

Definition of ‘DC potentiometer’ A DC potentiometer is a potentiometer in which the supply is a battery and the balance is under direct current conditions. … A DC potentiometer can measure voltage directly and measure resistance, current, power, and temperature indirectly.

Why do we use 3 electrodes?

In order to apply potential, we require some standard/reference electrode, whose potential is almost constant. … So we have to avoid using this RE as current carrying electrode. So we require a third electrode called Counter or Auxiallry electrode and its main purpose is to complete the circuit to carry current.

What is the role of counter electrode?

1.2, counter electrode is an important component in dye sensitized solar cells. The electrons transfer from external circuit to the counter electrode, which is a catalytic material to transfer electrons into electrolyte to regenerate the redox couple.

What is the definition of electrode?

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte, a vacuum or air).

What is indicator electrode in potentiometry?

Potentiometric measurements are based on the determination of the electric potential difference between a working electrode (usually called indicator electrode) and a reference electrode. Usually the transducer can be an ion-selective membrane, commonly known as ion-sensitive field-effect transistor (ISFET).

Why KCl is used in calomel electrode?

The advantage in using saturated KCl is that [Cl−] does not change if some liquid evaporates. If an electrode has a potential of −0.461 V with respect to a calomel electrode, what is the potential with respect to a silver-silver chloride electrode?

Why indicator is not used in potentiometric titration?

Potentiometric titration is a technique similar to direct redox titration reaction. It is a useful means of characterizing an acid. No indicator is used; instead the potential is measured across the analyte, typically an electrolyte solution.

What is null point in a potentiometer?

The potentiometer is connected between v1 and v2 as shown in figure hence if the galvanometer show null point states that no current flow through it. Condition is r1/r2=r3/r4 states there is equal potential at point v1 and v2 so, galvanometer shows null as no current flow due to zero potential difference.