Question

What is the pH when the hydrogen ion concentration is 1 x 10-3 M?
O a. 3.3
O b. 4
O c. 2.7
O d. 2
O e. 3

Answer 1

Answer:

e. 3

Explanation:

In order to solve this problem we need to keep in mind the definition of pH:

• pH = -log[H⁺]

As stated by the problem, the hydrogen ion concentration, [H⁺], is 1x10⁻³ M.

As all required information is available, we now can calculate the pH:

• pH = -log(1x10⁻³ M)

• pH = 3

The correct option is thus e.