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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.
What else can I help you with?
What is the half reaction of a saturated calomel electrode?
The half reaction of a saturated calomel electrode is Hg2Cl2(s) 2e- - 2Hg(l) 2Cl-
Can the saturated calomel reference electrode be used in strong alkaline media such as 2-5 N KOH solution?
No, the saturated calomel reference electrode is not suitable for use in strong alkaline solutions like 2-5 N KOH. The high pH environment can damage the electrode and affect its performance. It is better to use a reference electrode designed specifically for use in alkaline media, such as a silver/silver chloride electrode.
Is calomel ionic or covalent?
Calomel is mercury(I) chloride (mercurous chloride). It is ionic and contains the Hg22+ ion and the Cl- ion.
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.
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).
What is electrode potential of calomel electrode?
246 mV
Why mercury placed at the bottom of calomel electrode?
Mercury is placed at the bottom of a calomel electrode to provide a stable and well-defined interface between the electrode and the electrolyte solution. This helps to maintain a consistent potential at the electrode/solution interface, making it a reliable reference electrode in electrochemical measurements.
What is the half reaction of a saturated calomel electrode?
The half reaction of a saturated calomel electrode is Hg2Cl2(s) 2e- - 2Hg(l) 2Cl-
Why calomel electrode dip into kcl solution after the use?
The calomel electrode is dipped into a KCl solution to replenish the potassium chloride at its surface and maintain a stable electrolyte environment. This helps to ensure the proper functioning of the electrode and accurate measurement of the potential.
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
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
Describe construction of glass electrode?
The glass electrode is made in such a way that it is only sensitive to the specific ion.
Is Standard Calomel Electrode can act as cathode?
Yes, the Standard Calomel Electrode (SCE) can act as a cathode in certain electrochemical cells. When connected to a suitable anode in a galvanic cell or connected to a positive terminal in an electrolytic cell, the SCE can gain electrons and undergo reduction at its surface.
Can the saturated calomel reference electrode be used in strong alkaline media such as 2-5 N KOH solution?
No, the saturated calomel reference electrode is not suitable for use in strong alkaline solutions like 2-5 N KOH. The high pH environment can damage the electrode and affect its performance. It is better to use a reference electrode designed specifically for use in alkaline media, such as a silver/silver chloride electrode.
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
What is primary standard electrode?
A primary standard electrode is a reference electrode with a known and stable electrochemical potential that is used as a standard for calibrating other electrodes. These electrodes provide a precise and reproducible reference potential for accurate measurements in electrochemical experiments. Examples include the saturated calomel electrode (SCE) and the silver/silver chloride electrode.
