What is the Difference Between Calomel and Glass Electrode?
🆚 Go to Comparative Table 🆚The main difference between a calomel electrode and a glass electrode lies in their functions in pH measurements:
- Calomel Electrode: A calomel electrode, also known as a saturated calomel electrode (SCE), is a type of reference electrode. Reference electrodes are used to provide a stable reference point for the measurement of pH. Calomel electrodes contain mercury chloride (HgCl2) bathed in a solution of potassium chloride (KCl). They are sensitive to changes in temperature but provide a stable potential.
- Glass Electrode: A glass electrode, on the other hand, is a non-reference electrode. It is used to measure the pH of a system directly.
In summary, while calomel electrodes are used as reference electrodes to provide a stable reference point for pH measurements, glass electrodes are used to directly measure the pH of a solution.
Comparative Table: Calomel vs Glass Electrode
The main difference between a calomel and a glass electrode lies in their classification as reference or non-reference electrodes and the materials they are made of. Here is a comparison table highlighting the differences:
Property | Calomel Electrode | Glass Electrode |
---|---|---|
Type | Reference Electrode | Non-Reference Electrode |
Material | Calomel (Hg2Cl2) | Silver-Silver Chloride |
Usage | pH Measurement, Cyclic Voltammetry, Aqueous Electrochemistry | pH Measurement |
Calomel electrode, also known as saturated calomel electrode (SCE), is a type of reference electrode used for pH measurement, cyclic voltammetry, and aqueous electrochemistry.
Glass electrode, on the other hand, is a non-reference electrode used mainly for pH measurements. It consists of a thin glass bulb containing a fixed concentration of HCl solution, into which a silver-silver chloride sensor is immersed.
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