2.2 pg-26 of chapter 2 of class 10.                

Dear Student,

The pH of saliva before meal is 7.4
The pH of saliva after meal depends upon the food eaten. If the food was acidic like citrus fruits, curd etc., then pH will be in acidic range and if the food was basic like mint then pH will be in basic range.
pH of lemon juice = 2
pH of colourless aerated drinks varies from 5-6.
pH of carrot juice also varies between 5-6
pH of coffee is 5
pH of tomato juice 4.5
pH of tap water varies between 6.5 to 7.5
pH of 1M NaOH is 14
pH of 1M HCl is 0

The colour of different pH is given below, however depending upon the solution taken for pH test colour of pH may vary:


Regards

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