Stomach acid = 1-2
Lemon juice = 2-3
Apple juice = 3.0
Vinegar = 3.0
Wine = 2.8
Urine = 4.8
Saliva = 6.5
Milk = 6.5
Milk of magnesia = 10.5
Black coffee = 5.0
Pure water = 7
Sea water = 8.5
Toothpaste = 9.0
Blood = 7.4
Baking soda solution = 8-9
Ammonia solution = 11-12
Bleach = 12-13