Question

colour of pH paper of saliva before and after meal ​

Answer 1

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Value of pH and nature of the solution :-

(1) saliva before a meal slightly basic having green colour and its pH value is 7.4.

(2) saliva after a meal is acidic having yellow colour and its pH is 5.8

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Answer 2

Explanation:

colour of pH paper of saliva before meal is red to blue (basic) after meal blue to red (acidic)