Question

Solution
S.
No.
N
Colour of Approx- Nature of
pH paper
imate substance
pH value
S
2
1 Saliva (before meal)
2 Saliva (after meal)
3 Lemon juice
4 Colourless aerated
drink
5 Carrot juice
6 Coffee
7 Tomato juice
8 Tap water
9 1M NaOH
10 IM HCI
(56)​

Answer 1

Answer:

Explanation:

1)saliva (before a meal) is 7.4 which is slightly basic with green colour. 2) saliva (after a meal) is 5.8 which is acidic with yellow colour. 3) lemon juice is 2.5 which is always acidic with pink colour.