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六次甲基四胺[(CH2)6N4](Kb=1.49×10-9)及其强酸盐[(CH2)6N4H]+组成的缓冲溶液的缓冲范围的pH约为()。

  • A、4~6
  • B、6~8
  • C、8~10
  • D、9~11

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