• anonymous
(Will give medal!!) 1. Calculate the hydrogen ion concentration (H+) for an aqueous solution in which [OH^-] is 1 x 10^-4 mol/L. Is the solution basic, acidic, or neutral? 2. What reaction is spontaneous for the following cell? Ag+ + e- >>> Ag (E* = 0.80V) Ba^2+ + 2e- >>> Ba (E+ = -2.90V)
  • Stacey Warren - Expert
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  • schrodinger
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  • anonymous
For qn. 1, have you ever heard of the the equation [H+][OH-] = 1 * 10^(-14)? The value at the end is K, the equilibrium dissociating constant of pure water (since it is neutral yo u will have equal concentrations of both ion in solution 1*10^-7, and this value is very small since water is really weak at dissociating). By rearranging the formula and plugging in OH- concentration and rearranging, you will find the answer for H+ concentration. If you are not familiar with pH it is figuring out how acidic or basic a solution is, but using a logarithim scale. The general formula is pH= log [H+]. Use the concentration you got from the last step. For qn. 2 reactions that have a do not have a positive reduction potential do not occur at standardized conditions because they require larger amounts of energy. Hope this leads you to your answer.

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