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【单选题】
化学试剂硼酸主含量的测定中，因为硼酸（H 3 BO 3 ）在25℃的离解常数K1＝5.8³10 -10 ，所以必须在测定中加入丙三醇，使二者反应，其产物酸性比硼酸强，可以用碱标准滴定溶液直接滴定进行测定。此处加入丙三醇与硼酸所发生的反应是（）A.
酸碱中和反应
B.
配位反应
C.
氧化还原反应
D.
缩合反应
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A.
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B.
错误
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A.
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B.
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C.
synthetic
D.
manual
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A.
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B.
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C.
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D.
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A.
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