PH value of: 1) saliva (before a meal) 2) saliva (after meal) 3)lemon juice 4)colourless aerated drink 5)carrot juice 6)coffee 7) tomato juice 8)tap water

1) The pH value of saliva before the meal is 7.4. As pH is greater than 7, the saliva (before meal) is basic.

2) The pH value of saliva after the meal is 5.8. As pH is less than 7, the saliva (after meal) becomes acidic in nature.

3) The pH value of lemon juice is 2.5. As pH is less than 7, hence this shows that lemon juice acidic in nature.

4) The pH value of colourless aerated drink is 6. As pH is less than 7, hence this shows that aerated drink is acidic in nature.

5) The pH value of carrot juice is 5.6. As pH is less than 7, hence this shows that aerated drink is acidic in nature.

6) The pH value of coffee is 6. As pH is less than 7, hence this shows that coffee is acidic in nature.

7) The pH value of tomato is 4.1. As pH is less than 7, hence this shows that tomato juice is acidic in nature.

8) The pH value of the tomato is 6.9 to 7.1. As pH is around 7, hence this shows that tap water is neutral in nature.