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2. Calcitulation of pH and pOH for weak
Acids and Baes

If a weak acid if formulated as HA. Its ionization in aqueous

solution can be represented by the following equation.
+
-
HA ⇌ H + A
(aq)
(aq)
(aq)
If we let x be the amount of HA that ionizes per liter, we can
construct the following concentration table.

At equilibrium the acid ionization constant can be represented by

the following equation

Because Ka of a weak acid is so small, x is also small. Therefore

since
and

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