In water, the equilibrium
2H2O(l) ⇌ H3O+ (aq) + OH−(aq) Kc = 10−14
determines the concentrations of H3O+(aq) and OH -(aq). If the pH is 9.2, what is the OH - concentration? (note H3O+(aq) and H+(aq) are equivalent ways of representing a solvated proton and pH = -log[H+(aq)].)
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