Question

Orange juice is a common breakfast drink that contains citric acid. If the hydronium ion concentration is 3.4 × 10-4 in orange juice, what is the pH? (rounded to one decimal place)

Answer 1

3.5

Explanation:

Given : the hydronium ion concentration is
`3.4*10^(-4)` in orange juice

To Find: what is the pH?

Solution :

Definition of pH : pH is the negative log of the molar hydrogen ion concentration

Formula of pH : - log [H+]

Since we are given H+ =
`3.4*10^(-4)`

So, substituting this value in formula :

`pH = - log [3.4*10^(-4)]`

`pH = - log [3.4*0.0001]`

`pH = - log [0.00034]`

`pH = 3.468`

pH = 3.468≈3.5

Thus the pH is 3.5