The effect of a circular nickel wire as electrodes of a pH-sensor for acidity measurement

The aim of this research is to measure acidity using circular nickel wire as electrodes of a pH-sensor. Nickel has been chosen as material due to its benefit of being easy to find in the market with relatively cheap price. The variations of nickel wire diameter used during the measurement were 0.8 mm, 0.9 mm, 1.0 mm, 1.2 mm and 1.4 mm, whereas the variations of distance between electrodes were 0.50 cm, 1.00 cm and 1.50 cm. To ensure the distance, resin has been used to fix the bond between electrodes. A liquid pH-buffer has been used during the acidity measurement. The electrodes of the pH-sensor have been immersed during one minute in the liquid buffer. The results show that the best sensitivity has been obtained for acidity measurement along the pH-range of 1-7 using the combination of 1.0 cm of distance between electrodes and -1.1 volt corresponding with pH-level increment of 1.