The pk of weak acid h a is 4.5 the ph of an aqueous buffer solution of a in which 50% of acid is ionized is
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pH = pKa = 4.5
pH = pKa + log [ A - ] / [ HA ]
If an acid is ionized 50 %.
[ HA ] = [ A ^ - ]
pH = 4.5 + 0 = 4.5
As we know that,
pH + pOH = 14
pOH = 14 - 4.5 = 9.5
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