Question

what is the nature of saliva brfore meal

Answer 1

1. saliva(before meal)- 7.4
2. saliva(after meal)- 5.8

Answer 2

Saliva is a solution before meal.
The pH of saliva is usually varies between 6.5 - 7.5.It depends upon the food eaten.
After the meals, if the food conains acidic substances then the pH of saliva will be slightly below 7 and if you have eaten alkaline substances then the pH of the saliva will be slightly above 7.