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【单选题】
在有过量 I- 时，碘在水溶液中的存在形式主要是 I3-，也有少量 I2，而被有机溶剂萃取的是 I2，则碘在两相中的分配比为A.
D = [I2]o / [I2]w
B.
D = [I2]w / [I2]o
C.
D = [I2]o / ( [I2]w + [I3-]w )
D.
D = ( [I2]w + [I3-]w ) / [I2]o
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