Molarity = M = moles/L. You have 0.45 moles OH^-/0.250 L = (OH^-)
Then (H^+)(OH^-) = 1E-14
Substitute and solve for (H^+)
If 250 mL of an unknown acids was found to contain 0.45 moles of OH- ions, what concentrations was the unknown acids?
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