Measurement of pH (electrometric mathod)
Electrometric method (introduction, principal,mathod, advantage) Introduction - the pH of a solution can be determined by means of an electrode,whose depends on the hydrogen ion activity. The hydrogen and glass electrodes are typical pH electrodes, through the later one is commonly used ,glass electrode is a condensed or combined electrode i.e. this incorporates a reference electrode junction next to the glass membrane,so that both electrodes are kept in one unit . The pH sensitive glass bulb is made of lithia glass, which is suitable over entire range . Principal 1) the potential difference exist at the interface between glass and a solution containing hydrogen ion. 2) the magnitude of this difference varies with the concentration of hydrogen ions. 3) class electron is used for the pH measurement . 4) the glass electrode consist of earth in glass bulb of special class blown at the end of glass tube. 5) the bulb is filled with dilute acid I e desi normal hydrochloric acid solution,
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