Question

Color of pH paper of a)saliva(before & after meal) b)Colourless aerated drink c)Carrot juice d)Coffee e)Tomato juice f)Tap water

Answer 1

Saliva before meal is slightly basic with a PH value of 7.4. It is slightly more than the thresh hold of 7 on the scale.

 Saliva after meal becomes 5.8 due to the release of acid in the form of bile juice to digest food.

Lemon juice contains ascorbic acid; therefore the PH value is 2.58

Aerated drink contains carbon dioxide and soda, therefore the PH value is acidic with 6.0 reading

Carrot juice is 5.6 while coffee displays reading of 5.0 Tomato juice with 4.1 reading belongs to the string acid category.