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  2. World of Warcraft: Wrath of the Lich King - Wikipedia

    en.wikipedia.org/wiki/World_of_Warcraft:_Wrath...

    Patch 3.2.0 added the Crusader's Coliseum raid, a PvP season 7, a new Battleground, Isle of Conquest and some Argent Tournament quests. The final major patch for the expansion, Patch 3.3, 'Fall of the Lich King', was released on December 9, 2009. [23]

  3. Acid dissociation constant - Wikipedia

    en.wikipedia.org/wiki/Acid_dissociation_constant

    In acid–base extraction, the efficiency of extraction of a compound into an organic phase, such as an ether, can be optimised by adjusting the pH of the aqueous phase using an appropriate buffer. At the optimum pH, the concentration of the electrically neutral species is maximised; such a species is more soluble in organic solvents having a ...