The pK_(a) of weak acid (HA) is 4.5 . The pOH of an aqueous buffered solution of HA is which 50% of the acid is ionized is

The pK_(a) of weak acid (HA) is 4.5 . The pOH of an aqueous buffered s

1.	The pK_(a) of weak acid (HA) is 4.5 . The pOH of an aqueous buffered solution of HA is which 50% of the acid is ionized is
Answer» `7.0` `4.5` `2.5` `9.5` SOLUTION :When HA is 50% ionized , [HA] = `[A^(-)]` `PH = pK_(a)+log .([A^(-)])/([HA])=pK_(a)=4.5 ` (Given) `pOH = 14- pH = 14 - 4.5 = 9.5.