Given a 2.6 m solution of hclo4, what is the ph level of the solution?

The compound, HClO4, dissociates into H+ and ClO4- when dissolved in water. The pH of the solution is the negative logarithm of the concentration of H+ in molar. The concentration of H+ from the solution is also 2.6M.
                                  pH = -log[2.6]
                                  pH = -0.415

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