Problems in Measurement of Cell Potential of a Cell Chemistry Notes
Problems in Measurement of Cell Potential of a Cell :
Following three main problems are produced with the use of electrochemical cell:
→ There is continuous change in the concentration of nearby region of electrode due to which cell potential is not constant. So, it can not give reproduced electromotive force.
→ Cells are of irreversible nature. These should be more reversible. The value of temperature coefficient of cell is high. If we have to select a cell then above said problems should not be present in this cell. These problems are not found in “standard westen cell”.
→ There is also a problem in the measurement of cell potential that its measurement can not be done by voltmeter like apparatus because voltmeter represents only potential difference. So, cell potential can be measured by a suitable device. For this, “Poggendorff complementary principle” is used.