Question

What is the ph of a 2.7 m solution of hclo4?

Answer 1

The compound HClO4 will dissociate into the ions, H+ and ClO4-. So, the 2.0 M solution will also form 2.0 M H+. The pH is calculated through the equation,
                                   pH = -log[H+]
Substituting,
                                    pH = -log[2] = -0.3
So the pH of the solution is going to be -0.3.