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[" The pKa of a weak acid (HA) is 4.5.Th...

[" The pKa of a weak acid (HA) is 4.5.The pOH of an aqueous buffered solution of HA,in which "50%" of "],[" the acid is ionized,is: "],[[" (1) "9.5," (2) "7.0," (3) "4.5," (4) "2.5]]

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