14．重水D2O的离子积为1.6×10-15，可以用PH一样的定义来规定PD= —lgc(D+),以下关于PD的叙述正确的是
| A．中性溶液中PD=7 |
| B．在1LD2O的溶液中溶解0.01mol NaOD（设溶液的体积为1L），其中PD=12 |
| C．在1L D2O中溶解0.01mol DCl(设溶液的体积为1L)，其中PD=2 |
| D．在100mL 0.25mol·L-1的NaOD重水溶液中加入50mL 0.2mol·L-1DCl的的重水溶液，其中PD=1 |
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