The PH value of some common liquids. all of that is most important for Railways exam.
If pH < 7 then solution is acidic
If pH > 7 then solution is basic
If pH = 7 then solution is neutral
Liquid pH
Lemon Juice 2.5
Wine 2.8
Apple Juice 3.0
Vinegar 3.0
Urine 4.8
Coffee 5.0
Saliva 6.5
Milk 6.5
Blood 7.4
Pure Water 7.0
Sea Water 8.5
Toothpaste 9.0
Milk of magnesia 10.5