Question

Calculate the pH of a solution whose H3O+ concentration is 2.1 x 10-3 M. Is the solution acidc, basic, or neutral?

a

The pH of the solution is 2.7 and the solution is acidic.

b

The pH of the solution is 13.3 and the solution is acidic.

c

The pH of the solution is 13.3 and the solution is basic.

d

The pH of the solution is 2.7 and the solution is basic.

Answer 1

Option A, The pH of the solution is 2.7 and the solution is acidic

Step-by-step explanation:

As we know,

pH = - log [H3O+]

Substituting the given values, we get

pH = - log [2.1 x 10-3 M]

pH = - (-2.678)

pH = 2.678 or 2.7

The solution is acidic as pH value is less than 7

Hence, option A is correct