લાળ (ભોજન પહેલા) pH નું મુલ્ય કેટલું હોય છે.
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The $pH$ value of saliva before a meal is \[7.4\] , hence it is slightly basic to have a green colour. 2) The $pH$ value of saliva after a meal is \[5.8\] , hence it is acidic having a yellow colour.
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