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[" 6.The "pK(a)" of a weak acid (HA) is ...

[" 6.The "pK_(a)" 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 "],[[" (A) "4.5," (B) "2.5," (AIEEE "2007]],[" (C) "9.5," (D) "7.0]]

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