Which type of electrode is calomel electrode?

reference electrode
The calomel electrode is a reference electrode based on the reaction between elementary mercury and mercury(I) chloride. The aqueous phase is in contact with the mercury and the mercury(I) chloride (Hg2Cl2, “calomel”) is a saturated solution of potassium chloride in water.

Why KCl is used in calomel electrode?

When potassium chloride solution is saturated, the electrode is known as saturated calomel electrode (SCE). The SCE has the advantage that the concentration of Cl-, and, therefore, the potential of the electrode, remains constant even if the KCl solution partially evaporates.

How do you make a calomel electrode?

Calomel Electrode is made up of a glass tube with a side tube at the bottom of the glass tube mercury is placed above that a paste of Mercury and Mercurous chloride is placed. Mercurous chloride is nothing but calomel so the commercial name of Mercurous Chloride is Calomel.

What is the potential of saturated calomel electrode?

The saturated calomel electrode (SCE) The measured potential, E, of the SCE is +0.241 V (SHE) for a saturated chloride ion solution at 298 K.

What are the components of calomel electrode?

Calomel electrode is the mercury-mercurous chloride electrode. It consists of a glass vessel having a bent side tube. Pure mercury is placed at the bottom of the tube. Which is covered with a paste of mercury- mercurous chloride (Hg+Hg2Cl2) i.e., calomel.

Is calomel electrode a standard electrode?

Using reference electrodes unknown potential of any other single electrode can be found out e.g. two commonly used reference electrodes are standard hydrogen electrode (SHE) and Calomel electrode.

What is the EMF of saturated calomel electrode at 25 C?

The oxidation potential of saturated calomel electrode=-0.699V at 25^(@)C. A saturated calomel electrode is coupled through a salt bridge with a quinhydrone electrode dipping in 0.1MNH4Cl. The observed EMF at 25∘C is 0.152V.

What is the EMF of saturated calomel electrode at 25 Celsius?

The standard potential for this reaction is +0.268 V. If the cell is saturated with KCl at 25°C, the potential is +0.241 V.

What are the two main chemicals used in calomel electrode?

A saturated water solution of KCl (potassium chloride) is in contact with the mercury and the mercury(I) chloride (also known as “calomel”). Linking the electrode to the solution in which the other electrode is immersed is a porous frit, which is a salt bridge.

What is meant by calomel electrode?

A calomel electrode is a type of reference electrode that is based on reactions between mercury (I) chloride (calomel) and elemental mercury. The calomel electrode’s structure consists of an outer glass tube that is fitted with a frit at the bottom. This permits electrical contact with a solution outside the electrode.

What is calomel electrode give the reduction reaction?

Hg2Cl2 + 2e-→2Hg + 2Cl- Reduction half reaction, which. results increase in concentration of Cl- ions. Thus, Calomel electrode is reversible to Cl- ions. The reduction potential of calomel electrode is given by.

What is EMF of calomel electrode?

The standard EMF of deconormal calomel electrode is 0.268 V.