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bulk density

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That language can be used to refer to things that are not present in time or space is a good illustration of the______feature of language.

A. duality
B. displacement
C. arbitrariness
D. productivity

已知25℃时苯巴比妥的pKa=7．41，在水中的溶解度为0．1g／100ml，分子量为232．14。配制1．0g／100ml的苯巴比妥钠溶液，苯巴比妥钠的分子量为254．22，试求游离苯巴比妥在溶液中开始析出时的pH。