11/5    What is the difference between acidity and alkalinity? Doesn't
        one determine the other?
        \_ I think they are the same.  If the pH value is less than 7, they
           call the measurement acidity.  Otherwise they call the measurement
           alkalinity.
        \_ Yes.  Ph = -1*log10(concentration of H+ ions) =
                 Ph = log10(concentration of OH- ions) +14
           But the acids and bases contributing to the overall acidity
           can have complicated reactions.  Ph=7 = neutral
        \_ Yes, 10^-14 = [H3O+][OH-]
           So you see, if [H3O+] increases, [OH-] decreases, and vice versa.
           If there's more [H3O+], it's acidic; more [OH-], alkaline.
           -Former Chem1A/B TA
        \_ It's like asking if hotness and coldness are the same thing.
           They're different ways of refering to the same property, in this
           case oxidation/reduction ability.
                \_ Oxidation/reduction is actually different than acidity.