What is the electrode potential of calomel electrode?
The electrode potential depends on the concentration of chloride ion as like silver-silver chloride electrode. It is 0.280 V at 1M KCl and 0.241 V at saturated KCl which is so often called as SCE as abbreviation of Saturated Calomel Electrode.
Why is the potential of calomel electrode is constant?
For the Silver-silver cloride reference electrode or the calomel reference electrode the potential is constant because it contains a fixed chloride concentration.
How do you convert SCE to rhe?
For sake of clarity, considering the different pH of the solutions, all potentials are referred to reversible hydrogen electrode (RHE) according to the following formula: E(vs RHE) = E(vs SCE) + 0.244 + 0.059pH, with 0.244 the potential (in volt) of saturated calomel electrode (SCE) with respect to standard hydrogen …
When 1 N KCl is used in calomel electrode e0 value is?
1 Answer. Best explanation: For 1N KCL standard reduction in the calomel electrode is 0.28V.
What is the representation of calomel half cell?
Calomel electrode is represented as – `Hg(l)|Hg_(2)Cl_(2)(s)|HCl(aq),` Its `E^(@)` value is `+0.24V`.
What is SCE give its EMF value?
SCE potential But since the inner solution is saturated with potassium chloride, this activity is fixed by the solubility of potassium chloride, which is: 342 g/L/74.5513 g/mol = 4.587 M @ 20 °C. This gives the SCE a potential of +0.248 V vs. SHE at 20 °C and +0.244 V vs.
What is the variation in the potential of a calomel electrode with change in chloride ion concentration?
Answer: The potential of calomel electrode decreases with increase in the concentration of chloride ions at a given temperature. Thus, electrode is reversible with respect to concentration of chloride ions.
What is the value of reduction potential of calomel electrode at 25 degree Celsius?
0.28 V
Std reduction potential for calomel half cell is 0.28 V AT 25 C.
What is the half cell reaction of calomel electrode?
In the calomel half cell the reactions are HgCl(s)⇌Hg+(aq)+Cl−(aq)Hg+(aq)+e⇌Hg(s) The overall reaction is HgCl(s)+e⇌Hg(s)+Cl−(aq) This is equivalent to a Cl2(g)|Cl−(aq) half cell.
What is the electrode potential of a saturated calomel?
The most common reference electrode used in potentiometry is the saturated calomel electrode ( S C E). The concentration of the test solution is calculated using the Nernst equation. It can be used to determine a range of p H values of solutions. The electrode potential of the standard hydrogen electrode is zero.
What is calomel electrode made of?
Ans: Calomel electrode contain mercury in contact with calomel, i.e., H g 2 C l 2. A solution containing chloride ions, like a solution of K C l, is poured over. A Calomel electrode in which a saturated solution of K C l is used is called S C E (saturated calomel electrode).
What is the difference between Ag/AgCl and calomel electrodes?
In both electrodes, the activity of the metal ion is fixed by the solubility of the metal salt. The calomel electrode contains mercury, which poses much greater health hazards than the silver metal used in the Ag/AgCl electrode. ^ Sawyer, Donald T.; Sobkowiak, Andrzej; Roberts, Julian L. (1995).
How do you find the emf of a calomel electrode?
The emf of the calomel electrode depends upon the concentration of C l – ions in the solution. To determine the electrode potential of an electrode, a cell is set up using the electrode as one of the electrodes and the second electrode as the reference electrode. The emf of the cell is measured.