Determination of pH using pH meter
Determination of pH using pH meter ELECTROMETRIC DETERMINATION OF pH Many cases indicators are not a good tool for pH measurement. Such situations call for electrometric determination of pH. Its done usually by pH meter. pH meter consists of a glass electrode which when dipped into a solution develops an electrical potential depending upon the hydrogen ion concentration and this potential is read off the display which is calibrated into a pH scale. Electrode Potentials When a strip of metal (electrode) is dipped into water. It tends to dissolve owing to its solution pressure. P. While the atoms of metal go into solution. they leave behind their loosely bound valence electrons as a negative charge on the electrode. Since the electrode has developed a negative charge. it now attracts the positively charged metal ions which have already gone into solution. Some of the positively charged metal ions might reattach themselves to the negatively charged electrode. The tendency of the atoms