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Summary of Electrometric Method

THE Electrometric Method is that the most accurate of the methods employed for the determination of proton Concentration and also the accepted method for research and laboratory work necessitating pH measurements accurate to 0.1 to 0.001 pH and for checking and standardizing the Calorimetric Method, except in those cases where the presence of certain classes of drugs within the solution interferes with the measurement of the potential of the unknown half-cell.

The Electrometric Method for determining the proton Concentration, or pH value, of an answer consists essentially in measuring the difference in potential between two special electrodes up-to-date with, the answer by means of a null potentiometer, the electrodes and solution comprising an electrical cell, called a amount cell or chain, within which one electrode develops a possible in step with the cation Concentration of the answer, while the opposite electrode includes a constant, definite potential independent of the cation Concentration of the answer. the worth is obtained by measuring the potential of the mixture and deducting the potential of the known electrode or standard half-cell from that of the full.

The electrodes commonly used are the Hydrogen Electrode, the Quinhydrone Electrode and therefore the Calomel Electrode. the standard combinations are the Hydrogen-Calomel Electrode and therefore the Quinhydrone-Calomel Electrode Assemblies. it's essential in making the measurement that no current be drawn from the electrodes and this can be accomplished at the balance point with the null potentiometer.