Of the following given choices;
A. Battery acid with a pH of 0.8
B. Human saliva with a pH of 6.5
C. Baking soda solution with a pH of 8.0
D. Distilled water with a pH of 7.0
The answer is; A
This is because the pH of battery acid is lower than that of orange juice. The lower the pH, the higher its acidity. Properties of acids are that they have a sour taste to the tongue and are corrosive. A pH of above 7.0 means the substance is basic.