What is the pH of a .040 M solution of HClO4 ?

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Explanation: 

We recongnize that HClO4 is a strong acid.Beacuse it is a strong acid,it is completely ionized,giving [H+] = [ClO4- ] = 0.040 M .The pH of the solution is given by pH = - log 0.040 = 1.40 

Answer: 

1.40