[MEdeviant]

This should be simple but I've been out of school for a while.  My research on the internet has led me to a solution and I would like confirmation that it is correct. And if not, where I erred.

Q:  Calculate pH of aqueous solution of Hydrogen Peroxide (H₂O₂). Concentration of H₂O₂ is 500 mg/L.

A:  Molecular weight of H₂O₂ is 34.015 g/mol.
     .5 g/L ÷ 34.015 g/mol = .0147 mol/L = .0147 M

     pH = -log[1x10^-14 ÷ .0147 M] = 12.17

[AWK]

http://www.h2o2.com/technical-library/physical-chemical-properties/thermodynamic-properties/default.aspx?pid=51&name=pH-and-Ionization-Constant