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It consists of tube in the bottom of which is a layer of Mercury ,over which is placed a paste of Hg+HgCl2.The remaining portion of cell is filled with a solution of normal or decinormal or saturated solution of KCl. a platinum wire dipping into the mercury layer is used for making electrical contact. the side tube is used for electrode is formulated as;Hg,Hg2Cl2,KCl.
the electrode can be coupled with the hydrogen electrode of unknown pH.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoA calomel electrode is a much more practical electrode than a Standard Hydrogen Electrode (SHE). The Standard Hydrogen Electrode has a defined potential (by international agreement ) of 0.00Volts which makes calculations easy but it is not practical for on-site measurements and other situations. The calomel electrode is very practical and very robust and is one of the most common electrodes used in corrosion studies etc. They are also relatively low cost.
Wiki User
∙ 10y agoThe Saturated calomel electrode is a reference electrode based on the reaction between elemental mercury and mercury chloride.
Wiki User
∙ 9y agoA calomel electrode is a reference electrode consisting of mercury, mercurous chloride, and potassium chloride.
Wiki User
∙ 9y agoCalomel is Hg2Cl2; electrodes containing calomel are frequently used in analytical chemistry.
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Can the saturated calomel reference electrode be used in strong alkaline media such as 2-5 N KOH solution?
No, Use a Mercury Oxide electrode in alkalai Media. Strong NaOH will damage glass. Available from Koslow Scientific Co.
Is calomel ionic or covalent?
Calomel is mercury(I) chloride (mercurous chloride). It is ionic and contains the Hg22+ ion and the Cl- ion.
Difference between reference electrode and indicator electrode?
Often electrochemical studies are interested in one of the electrodes of the cell only. The second electrode is present to complete the cell. Electrode of interest is named working electrode or the indicator electrode; the second electrode is know as reference electrode or auxiliary electrode (counter electrode).
Explain the theory behind the potentiometric titration of acid base?
In potentiometric titration, the change in the concentration of H+ ions are monitored based on the emf measurement with respect to Saturated calomel electrode ( a reference electrode having a standard reduction potential of 0.2422 V). H+ ions concentration in terms of pH change is measured using primarily by quinhydrone electrode. Based on hydrogen electrode also it can be measured. An electrochemical cell consists of H+ ions (acid to be titrated) in contact with hydrogen gas (1 atm) or quinhydrone/ quinone should be formed and the emf (potential difference) of the cell is measured with reference to saturated calomel electrode (SCE). Then based on Nernst equation value of standard electrode potential of hydrogen ion is, EH = Eo + 0.0591 log [H+] or EH = - 0.0591 pH since Eo = 0 V and -log [H+] = pH So EMF of the cell is Ecell = ESCE - EH Ecell = 0.2422 - EH The Ecell value is plotted ( Y axis) against volume of base added (X axis). The volume corresponds to drastic Ecell change gives equivalence point of the titration. At equivalence point all the free H+ ions are replaced as H2O and this is reflected and can be inferred in the Ecell values.
What are the Types of ion selective electrodes?
glass electrode, antimony electrode, the hydrogen electrode
Why mercury placed at the bottom of calomel electrode?
because calomel act as a reference electrode
What is electrode potential of calomel electrode?
246 mV
Why calomel electrode dip into kcl solution after the use?
because that tip of the calomel electrode is made up of porous nature..If we keep it in environment, its get oxidised,,
What is a good substitute for a saturated calomel electrode?
For example, the silver/silver chloride electrode (without mercury).
What is the advantages of calomel electrode?
It cannot be used above 50 degree because the Hg2Cl2 breaks down,yielding an unstable readings. Mercurous chloride used in calomel electrode is a toxic substance
Describe construction of glass electrode?
The glass electrode is made in such a way that it is only sensitive to the specific ion.
What is the dis advantages of calomel electrode?
It cannot be used above 50 degree because the Hg2Cl2 breaks down,yielding an unstable readings. Mercurous chloride used in calomel electrode is a toxic substance
Is Standard Calomel Electrode can act as cathode?
SCE can act as both anode and cathode according to the nature of other electrode.
Where can you buy saturated calomel reference electrode?
(UK) ACM, scimed, Sentek
What has the author Walter Fieldhouse Clarke written?
Walter Fieldhouse Clarke has written: 'I. A study of the hydrogen electrode, of the calomel electrode and of contact potential. II. A study of the ethylene electrode. III. Studies in oxidation and reduction ..' -- subject(s): Accessible book, Electrolysis
Can the saturated calomel reference electrode be used in strong alkaline media such as 2-5 N KOH solution?
No, Use a Mercury Oxide electrode in alkalai Media. Strong NaOH will damage glass. Available from Koslow Scientific Co.
What is the formula for calomel?
Chemical formula for Calomel: Hg2Cl2
