finding concentration of H30

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[d40chave]

   What is the concentration of H3O+ (same thing as H+) in a solution that is 2.63 M HNO3? 

[kyle1990]

since the concentration is > 0, you don't need to take the - log. Just take the log(H3O+) = [H3O+]. Taking the -log will give a negative concentration, which isn't reasonable here