Distinction of Ph Levels of Orange Juice and Milk of Magnesia in Comparison to Distilled Water
Cooper, A., Do, J., Francois, F., Olaleye, O. Lab Section LA: 06/20/2012
Introduction pH is the measurement of the concentration of hydrogen ions in a certain solution. Solutions or substances that have a higher concentration of hydrogen ions are considered acidic on the pH scale. Therefore, a solution with low concentration of hydrogen ions is basic on the pH scale.
The pH scale is a universal means of measuring pH. It ranges from 0-14, with 0-6 being acidic,
7 neutral and 8-14 basic. In this experiment, the rationale is that since the orange juice and the milk of magnesia are not pure orange juice, which is acidic, and pure milk of magnesia, which is basic, then it is the same pH of water, thus the hypothesis is if orange juice and milk of magnesia have a pH 7, then it has the same pH level as distilled water. The aim of this experiment is to determine whether orange juice and milk of magnesia have a pH of 7 or near to 7.
Three 50 mL beakers were obtained. 22 mL of orange juice were measured and placed into one 50mL beaker. The pH meter was then calibrated with distilled water. After the calibration, the electrode was place in the orange juice. The pH level was recorded and the electrode rinsed with distilled water and patted dry with a KimWipe. Next, 22 mL of milk of magnesia were measured and placed in a 50mL beaker. The electrode was placed in milk of magnesia and the pH level was recorded and the electrode rinsed with distilled water and patted dry with a KimWipe. Finally, 22 mL of distilled water was placed in a beaker. The electrode was placed in the beaker and the pH level was recorded and the electrode rinsed with distilled water and patted dry with a KimWipe. This method was repeated twice more for a total of 3 trials. Water was the control variable, while the dependent variable was measuring the pH levels of orange juice and milk of