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What is the acid dissociation constant for a 0.010 M solution of the unkown acid HX that has a pH of 2.70 at equilibrium? I know the answer but not how to get it, please help? Thanks in advance.

A galvanic cell consists of a Mn/Mn^2+ electrode (E° = -1.18v) and a Fe/Fe^2+ electrode (E° = -0.44v). Calculate the ratio [Mn2+]/[Fe2+] if E_cell = .78v at 25°C. I know to use the nernst eq. E_cell = E°_cell - RT/nF * ln(Q) where Q is the ratio I'm looki...

Which of the following substances will give an aqueous solution of pH closes to 7 and why? KNO3 NaHCO3 NH4I NH3 NaF Looking through my notes for an hour--can't find this one. Thanks in advance!

Thanks for the help, but I keep getting 4*10^-4 and not 5*10^-4 which is what I'm told the correct answer is. :S

Got it, thank you!

*closest to 7