In chemistry, the pH of a substance is defined as
pH = -log[H+] ,
Where H+ is the hydrogen ion concentration, in moles per liter find the pH of each substance.

Substance Hydrogen ion Concentration
a) Pineapple juice ....................1.6 × 10-4
b) Hair conditioner ......................0.0013
c) Mouthwash ........................6.3 × 10-7
d) Eggs .................................1.6 × 10-8
e) Tomatoes ...........................6.3 × 10-5

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Acidic HHpH pH pH pH pH pH pH pH pH pH pHpHp 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Neutral Basic